"Letting every race get 17 in a main stat will definitely help sell copies"
No, it wont, because the so called 'casual' won't be paying attention to this type of news. They are 'casuals'. They don't care that kind of stuff hence the term 'casual'. Every person arguing for and against these stat changes are 'stat nerds'. Because we do care for whatever reason.
"People shouldn't need to consult forums or books to figure out why or how something works, by and large."
Yeah, they should. Learning how a game works - how anything works - is part of the process. I fact, that's one of the best parts of playing a new game.
If you can play a game without thinking without challenge.. what's the point of playing a game? Just read a book or watch a movie.
This is a 100 hour turn based 5e with 1000s of rules... racial stat changes doesn't change that. In fact, it makes it more 'complex' for the casuals because it is another layer of choice for them. And, it basically makes choosing your race LESS important. Making choices less important in a game touted for its choices is not good. It is also why respecc is lazy game design for the most part.