Hey there. Brand new to these forums so this may have already been discussed. Seriously considering pledging since MOM is one of my all time favs and I still play it a lot thanks to GOG.
My concern here is more, are the names being changed purely for flavour? The only issue I really have for that is that on some level I find it a bit innately obfuscating. If one faction has a bowmen and another has an archer, it seems like an extra layer that I need to peel back when I am making my decisions while playing the game, for arguably limited benefit.
I understand flavor is still important (I'm a bit more lenient towards the undead faction being different, since by the sounds of it they will more likely play differently). Word/name use is still important however, because people will still be drawing on all their previous experience from various 4X games to make associations. For instance, when I hear the word "Pioneer" I'm immediately reminded of the Pioneer unit from Colonization. My first instinct is "Can I now improve tiles in a MOM game!?" But if Pioneer is just the elf specific name for "Settler" (unit that creates new cities), then there's some innate inertia that must be overcome while playing the game.
If there are differences between the units (Dark Elf Warlocks vs Magicians) then the name change makes total sense and I'm 100% behind.
Obviously at the end of the day, these are things one will learn to deal with when going forward and eventually get used to. I just like my flavour to be used in a way that is less obfuscating at a glance.