I've heard of This is the Police but I haven't played it unfortunately. But the post about operations from Chris is what originally inspired this, is there another one somehwere that you created?
I would 100% recommend Long War 2 if you enjoyed XCOM2 though. Its a free mod available in the workshop that was officially supported by Firaxis in a deal with another development studio. It was a better expansion than WOTC in my opinion but there was a single mechanic that was unabalanced and made it very difficult to complete, which is my only frustration with it.
The nuts and bolts of it is that it significantly rebalances the game and adds new mechanics. So instead of every mission being relatively scaled to your tech level, you would get a mix, some easy missions you could deal with using a couple of troops, some that would be very difficult even with your best squad and weapons. It would tell you what kind of threat level to expect before embarking. New missions spawn all the time with the idea that you can't and shouldn't try to do everything. You pick your battles. But because it remixes the skills, it gives you more options on how to win too.
You can basically have as many squads as you want, give them squad icons and squad names, up to 12 men per squad. I called them legions being a 40k fan. So Fox Legion were all decked out in black power armour, were all clones of the commander (MGS style) but with different specialities, haircuts, weapons and voices. They were my hard hitters, for the most difficult and most mission critical operations so I would give them the best gear first (weapons/armour are manufactured individually like xeno 1 and X-Com) and reserve them for when they were needed. The training mechanic at geoscape level allowed you to keep giving them extra stats/skills while not on mission.
My other squads did most of the work, I'd send them out on lower priority stuff. So rather than having a somewhat 2 dimensional menu based operation like WOTC where its all behind the scenes, you would actually do the fighting for varied objectives (more varied than in vanilla XCOM2), and as you had a LOT more soldiers under the organisation, often with different mixes of soldier specialisation, this would allow you to tailor squads as you saw fit, and deploy the most relevant squads according to the tactical situation.
It really adds character to the game to have squads with their own feel, strengths and weaknesses. I still had squads with ballistic level weapons doing the light grunt operations while my legions had power armour, plasma weapons and bolters (that last one being another mod weapon). Others still were stealth specialists, others had psionic troopers. You essentially deployed whole squads but you could draft in people from other squads to fill the gaps in they were under strength, or split them up to cover more operations if needed. The squad Icons would show were they were on the geoscape. You could apply uniforms to whole squads rather than doing it individually, you would have one officer per squad with an officer perk/rank progression tree, and everyone else had the standard rank progression (but perks are all remixed in LW2 anyway).
You could also assign a soldier, engineer or scientist to a regional haven to give that region a boost in things like recruitment, intel/more missions etc.
As you can imagine, going back to XCOM2 WOTC, despite the fancy new graphics and new mechanics, felt like being used to commanding and coordinating an entire war, but being demoted to overseeing weekly food shopping.
Some additional info on LW2 in general
Missions had infiltration times, fitting in with the resistance theme, which also makes contextual sense with the cold war setting here. They would have to infiltrate behind the scenes until the timer ran out, at which point you could start the mission. You could start prematurely but this would make it much harder, you could also allow them to infiltrate longer than required for an easier time. This meant you could have say 6 squads on deployment and one in reserve, with the option to instantly recall squads if something more pressing came up. You didnt have to deploy all soldiers in the squad either, the ligher armed and less of them there were when you launched the mission, the less resistance you would experience unless it was one of the mission types where it was always going to be guns blazing from the get go.
One of my best memories of LW2 was going into a mission that was extreme difficulty, I sent in 1 guy, who was a stealth specialist with a shotgun and katana. This dude avoided enemy patrols, broke into a base, stole a resource I desperately needed, stole a fancy alien corpse I hadn't seen before (there a lot more variation of enemies than vanilla XCOM2, and I had a mod that allowed you to pick up corpses like in OG X-COM) and set off all the alarms. Then he made a hasty retreat to the extraction zone under fire, but dishing out death as he fled due to him being one of my best and also having extra movement tiles due to his speciality. I managed to win a mission I had no business winning due to the flexibility of the systems.
Writing this has made me want to play it again god damn it