No. Especially #4 is a gameplay change. Either you have game in sunlight and beeing able to spot enemies 20-30 tiles away and snipe them or you have darkness and spot enemies 4 tiles away and go into close combat. Or a bit of both. Still, they represent very different playstyles/experiences. So no, not cosmetic. X-com 1 and TFTD had (some) murky maps and night missions very truly scary (=awesome). And IMHO that represent the UFO genre best. Like in ET, Close contact, X-files aliens often lands/flies in darkness.
And the rest of my proposals is not less functional to me. To be able to spot where I can go and still shoot at a glance instead of having to check every single tile is more functional for me.
About #5 yes one can change rotation in the demo. But if 90 degrees is the standard one should you not be able to see every tile on the board from at least one of the angles?
So, to summarize, I dont see that any of my suggestions are less functional, at least not to me. To me they are more functional, or the same level of functional and prettier.