To me the survey is useless for improving the game, what it does is identify the real duds that no one likes, and that probably is all WotC cares about anyway
I've believed this is what the surveys have
always been... just seeing which new ideas at a basic form are intriguing to players. Basic opinions on what a lot of people like or don't like about potential ideas. But that's it. It has NEVER had anything to do with asking the playerbase to try and
improve the game... because quite frankly I don't believe ANY of us could improve this game with our ideas in any meaningful way to the pleasure of almost everyone. I've
seen what a lot of you here on EN World think is so "massively important" to making Dungeons & Dragons "good", and my response is quite often "Are you kidding me? That would freaking suck!" So I'm sorry... a large amount of what each of us think would "improve" the game... would not in any way, shape, or form actually do so-- other than making it better
for us personally. And WotC knows this better than anyone.
These playtests are merely about just throwing us in the playerbase a bone to get some of our opinions on some new ideas. Some new ideas we have liked-- Ad/Disad... Weapon Masteries... Cunning Action. Other ideas we haven't-- Spell lists by power source... Wild Shape templates... the Warlock as a half-caster. And for any of those incredibly basic ideas, does it matter if the surveys were "representative" of the
entire playerbase? No. Not in the least. Why? Because most of the players
doesn't give a crap. It's a game. They see the rules, they use the rules. End of story.
It's only us idiots who demand the rules fit our personal beliefs of what a "good game" is that give a crap with how these playtests and surveys run. And when we find that our personal beliefs of what is a "good game" or "good rule" gets shot down by a bunch of other people... that's when we get all bent out of shape and turn up our noses and insult the WotC machine for being stupid or biased or lazy.
When actually the truth is even simpler... we just all have bad taste when it comes to the design of a game meant to try and please
millions of people all at once.