Everything used to be, one of the reasons for CISC instruction sets is the complex instructions do many things at once, which is very convenient for programmers. An assembly instruction becomes more like a function call that does several low level things. Sure CISC assembly is more complex, but if your are an experience programmer those complex instructions do things that you find very useful and make your program more maintainable. Part of the problem with modern assembly is new instructions have been shoe-horned into existing CPU designs instead of elegantly designed in from scratch, the fact that they had to fit those instructions in meant that compromises had to be made.

Today there is no point. Optimizing compilers have gotten very good, and while it is still possible for hand tuned assembly to beat compiled code, with compiled code you change a flag and your code is optimized better for some other CPU that the hand tuned code for a different but compatible CPU. Then change a flag again and your code runs on a completely unrelated CPU family.

I started game development around the Gameboy Color days and everything was in assembly. Every other platform had shifted to C/C++.

It wasn't bad actually. We had macros to do 16 bit work with 8 bit registers, etc. so the code was much more high level than it sounds. We did have to be very careful with the stack (making sure it's balanced), but otherwise very similar to coding in C.

With modern architectures, I much prefer C and intrinsics and let the compiler deal with it (and nudge it when it gets it wrong).

Almost all console and microcomputer games were assembly until well into the 80s. Atari 2600 games, for example, had 2kb of ROM and 128 bytes of memory. Careful handcrafting was required not only to get the game to fit in the cartridge but to "race the beam": reprogramming the sprite registers as the image was generated, line-by-line, to achieve more sophisticated graphics.

(Original Spacewar was PDP-11 assembly. Original Colossal Cave appears to have been FORTRAN.)