PPSSPP Feature Request Page

[LunaMoo]

RA extra features are unrelated to actual PPSSPP, if someone added some feature there and decided to limit it same way, it's their decision, most likely if it behaves same way it's probably just same feature renamed for no reason, RA is famous for awful UI and weird option naming.

PPSSPP as of now does not have a GPU based texture scaling at least not officially, there is this branch which does it on the gpu and works well enough for some games, but even through gpu is much faster at scaling, doing it in real time also requires much more powerful hardware(heavily differs per game and resolution used).
My personal builds includes that realtime texture scaling if you want to check it(D3D11 backend required, but it's pretty much best on windows anyway).

As of the old CPU based texture scaling, nothing really changed outside of the fact that it's slower on Vulkan backend which became default from some time, so in reality scaling for most people became slower, not faster;p, the only reason most people will not notice is exactly because of those limits still being in place and that just proves they should still be there.
Even on modern desktop cpu's ppsspp's texture scaling can easily cause stutter or frame drops depending on game, multiplier, resolution used and algorithm choosen for scaling. Just because fps display will show max fps, doesn't mean it's smooth and unfortunately a lot of people don't realize the problems they're experiencing might be caused by texture scaling, allowing it without limits is just asking for trouble especially when most popular psp games are also among the most demanding ones.