All those things also require good internet and a good computer, which half of SA-MP players don't have.
that's pretty false, you just need to optimize your scripts
remember back when i had bad pc? I had way more fps on busy mta server then on AX.(also when i played mta with R he wondered how its possible he is getting 55fps on his old laptop at fully fledged racing server with speedos etc.)
and the thing about the feeling and etc:
yes, i admit some of servers have strange ideas etc, but if we make server, nothing prevents us from making it similar to sa-mp in some aspects( heck we can even bruteforce old gtasa bugs back in)
and internet:
noone is saying we have to load 1000 custom maps and textures, that's wrong imo, but with average size of map at about 100kb and proper streamer there should be no net problems.
"mta has too much not needed functions":
mta indeed has a lot of them, but i dont call them unneeded, noone forces you to use them.
for example the setHelicopterRotorSpeed is natively used in engine for sync, so why not make this function so you can have quickstart or simmilar thing to /sos with speed etc saved?