Not the first thread about models discussion. Most of the bugs i have collected in the QoL list and Andy know about it.
I don't agree with the statement like "It was for 6 years, so let it be. People become accustomed to it". A lot of UI mistakes was in the game since 2013, and got fixed in community patches since 2017. But it is strongly scoped with modding tools restrictions (once again). Here is some unused models in the game. One of them i used for my suggestion about penals to change them into regular soviet Strelky (Riflemen).
https://www.coh2.org/topic/59641/graphical-design-suggestion-about-penals
I am for changing winter uniform for Grenadiers, but summer variant looks fine and, as stated before, historical accurate.
On the other hand, it changed model stack perfectly with new Ostheer commander abillity. Regular grenadiers can be like this:

And "sergant" 5th man get Splittertarn from vanilla grenadiers with scoped G43. Looks cool for me.
Icons and portraits isn't problem. Here is a lot of artists, who can prepare UI stuff for it.
Source for the grenadiers image:
https://www.coh2.org/topic/53691/which-infantry-models-would-you-change-if-you-could