The issue here is that GDI don't have a high tier anti-vehicle infantry apart from Ghostalker.
If kill-whoring can be achieved, then your game is badly designed.
The Enforcer infantry isn't that unrealistic to TS/FS if you think about it. Between the X-O Powersuit from that one Tiberian Dawn cutscene and the Zone Troopers from C&C3, there's got to have been a missing link, the Enforcer is that missing link. Also bear in mind that Reborn actually takes place towards the end of and post Firestorm.
You can't design an FPS to be exactly like an RTS. Doing so would be incredibly short-sighted because the two genres of game simply don't play the same way. Emphasis has to be put on the infantry a bit more because if they worked exactly like their RTS counterparts, they would be incredibly frustrating to play as. Also, infantry need to be able to stand on their own a bit, because if the War Factory gets taken out it would just become killwhore central. To reiterate what I said before, moderators shouldn't have to enforce rules that are based on bad game design.