They didnt give persay an answer but I would imagine it was removed due to those that played it on geforce now complaining about:
- loading times taking up to 5 minutes to even start the game then another 5 minutes to pass loading screens
- ping being much much higher than playing it from a PC, although that varied a lot by location of the server.
- FPS being incredibly horrible (10-30 FPS ) in most situations and capped at 60 fps, raids were completely unplayable.
- marketplace not working over gfn.
- crashes (although it was the 32bit client which is now obsolete)
I am fairly confident that the UE4 version would perform much better than the old one but, I have doubts it would improve performance drastically. You would still suffer the same lags, fps and other issues. Personal opinion: IF the publisher / developer cant guarantee a stable and fluid gaming experience, the game shouldnt be on gfn.
And yes I played it on gfn aswel back then just to try it out, and it was horrible, I went back to my at the time, "medicore" pc because the performance was better and you were able to apply your own tweaks to get even more fps out.