Of course TS4 is different but the way TS4's build mode was done I don't think we'll see what we saw in TS2 or TS3 if EA does implement CFE into TS4 which unfortunately to me makes TS4's build mode seem pretty dumbed down in favour of other things that themselves didn't even feel so fleshed out which makes one wonder why they burned builders over in the first place.
Tbh though, if it was a technical nightmare to implement then they should be truthful and say something about it not being possible and promise to introduce more build features into later patches or EPs rather than to keep up a lie. Them running around and giving a split answer or double side is really fustrating.
Now I think maybe that they modified something in build mode like the wall heights and such that do make it harder to implement a cheat like that due to the instability of CFE in previous games.