You are making such misinformed assumptions, it's not even funny. I have worked on GBA, DS titles. Other people here have as well. I also have made pixelart to a lot of different specifications for the fun of it, such as (yes) C64, Amiga, Atari ST, ZX Spectrum, MSX, and others. Quite a few people here who do pixelart for a living, myself included, do not do gamey pixelart in their freetime. I do enough of that when I work.
But any of those people you mentioned, GBA Spriters, RPG-Maker folks or whoever else, could come here, post their stuff, and will get crits with what they are trying to achieve kept in mind. It is not like we are trying to force some artistic vision on anyone. Have you read Helm's thread on clusters? That is at the ground fundamentals of what makes "dot" art as you call it, taking the smallest element into account and how a single pixel change can make a big difference, esp in small resolutions.
So really, I have no clue what you are even trying to say, are you suggesting what we do and "dot" art is somehow different?