If you would create major socionics website, you could impose different system and it could be eventually adopted but you struggle with properly describing this system in just a forum post giving references to little known model R. But it would be rather not be accepted easily anyway and people would complain.
But telling people to change the system to different from what is on ALL websites is pretty futile.
Using different notation than anyone else does not make any logic really.
The reasons for this are not strong either, there is no reason to change ILE to IL+. People are not getting confused by I either, I don't see really problem.
Don't forget that the purpouse of this website is also to acquire people from MBTI world, so using similar notation is welcomed. And I dont see anything wrong with using SiTe because other notations are just less useful, like more difficult.