I mean, what did you expect? The game is six years old. Of course Relic isn't going to release anything new at this point. And releasing mod tools would require a huge effort with very little gains for them.
They could, however, restore what they removed.
When the game was released, it was possible to import and edit models. A.Soldier has plenty of screenshots of CoH 1 units being loaded into the game.
At some point Relic or SEGA disabled this without publically giving a reason. Were I to speculate, I'd assume it was to prevent mods competing with official DLC.
Turning it back on would vastly increase what modders are able to do with CoH 2.