nope, they do it in unity because it's a C++ / c# oriented language, and their base is windows which is on most PCs gamers use.
also the other reason is - they want 3D. if developers did 2D games for PC, we'd be stuck playin' pinballs today instead of battlefields and what not.
also unity isn't that great despite from you thinking "everyone is using it", and i haven't really played a lot of unity games, most people stick with c++ / and i saw a few c# games / for games.
also what you're descibing is wierd. you compared Crosswalk and "native APK". not PC game. Native for android is Java, and therefore it's run in java virtual machine. which transforms code to bytecode which is then used on cpu to run your game. HTML & JS have a bit more to do - interpreting -> compiling -> bytecode - > cpu. of course it's slower. adding crosswalk over that slows even more. but even though it's a layer above java it's still fast, and no, doing "native" which is really not native, would be just a pain in the ass for scirra to do. losing 2 years on something that hardware will anyway eat sooner or later + new JS browsers/compilers that are way faster - > no point in it. Everything else that makes your game slow down - is your bad design.
Also if you didn't know - 3D runs way faster then 2D on all hardware (don't let me get started about this...).
you should stop complaining and leave if you don't like c2. there's java. learn it and android sdk and build your game in androids native language. good luck with that.
davarrcal - noone didn't say that native was slower, it's a layer less but not so much faster. also even native depends on loads of factors like - language it was written in. c# / c++ / java / c - they all give native, but different performance. also you've tried games on your galaxy tab - which has a pretty weak graphics and very very slow cpu. also an old android version. i agree that people maybe don't have money to buy newer hardware, but if you buy a bad mobile phone and expect it to do everything, maybe you should reconsider / save more money for something better.
the easiest is to complain, everything else is hard