However, Pokemon remains, atleast the main vein, to improve on something and keep up a standard. While there are failures and issues, for the most part, it's still an enjoyable game.
Seems to me like Nintendo's idea of improving Pokemon is "making up so many new Pokemon your brain will explode".
Has EA capitalized on this and just sent out something that works better when tweeked by others than the stand alone?
Not intentionally. It happens all the time with games - modders will invariably improve the quality of the game. They're not constrained by time, money or managerial direction, and as gamers they know what they want.
Why were some issues not checked, or verified, or overseen before launch?
This one actually stumps me. They had months to fix a glaring issue - the Story Progression options toggle - but left the bug in the release product.
I think it proves that EA has changed focus from "making a better game that will sell well", to "making a game, then marketing that game to the widest possible audience while withholding 50% of its content to sell at a premium online, and then marketing the game some more, then putting ads in it to make more money, then releasing a branded tie-in, then rehashing the Pets expansion yet again to make an extra few billion dollars".