Well I work as DevOps/SRE/SA (depends on organization really, recently even as backend developer primarily developing Platform Engineering platform for team of developers, so they can use it without dealing with Ops part, hence I have strong background in Software Engineering with Go, Java and Python background (wrote plenty of tools and worked on various micro-services based projects) and also have solid foundation with C#, because with how many ecosystem I have encountered and worked with - yeah, not experience with game dev I know.
But I absolutely suck at everything Frontend, UX/UI related. Not that I am stranger to it, but they are my weaker side. And also when it comes to design, I might be good at planning and executing architecture of an entire or part of a product ecosystem and business logic but things like maps/level design and etc, a big no.
So, what I am trying to say backend I can do but if bulk of development is around implementing intuitive interface, yeah that's another story.
As for Asset Bundler's limitation, personal opinion and in regards to investment and engineering effort, as far as things as integration, adaptability, unity plugin's approach wins, consequences are minimal. And you can even make money of it by charging on Unity store, if you chose due to shareability options
As for standalone tool, there is much more complexity involved there at each stage of operations we would want to achieve, particularly when it comes to handling formats and loading to Unity assets and etc, it's a lot more complexity (like even possibility of having to automate some process in Unity editor itself, which sort of is contradicting) and effort with really the benefit being flexibility (plus the class-platform being another thing to consider).
Not to mention, for me personally anyways, it's easier to learn to us Unity as platform and write plugin in C#, it's not really an obstacle just takes a bit time than the secondary tool from ground up, just my two coins.
Edit: Assuming this actually comes to life, given the Unity drama going on. And just to be clear my understanding Unity is very basic, going back to days when I just play around with mini project, when it was still Unity 4, so yeah very much useless by now