Reasons why not:
Next-gen consoles suck
You can already use a controller with roblox, look at userinputservice on the wiki, a developer can recieve input from a controller
Keyboard and Mouse have better precision
Not all games support gamepad input, it's up to the developer whether he wants to implement it, and very few do so far.
If you just want to play with a controller, find a compatible game, plug it in and use it, no need for ROBLOX to release and maintain it on Xbox and PS4 |