So, I grind out multiple Accounts for years and you mean to tell me....

That's a Google play change not an EA one. As with any kind of SSO mechanism the app itself has no input into how it presents itself or works,. To fix it:

Open the play app. Go to settings- your data -change account for games. Find the game, and the option to "ask me every time" should be there.

So yes your anger is misplaced, and really just create EA Play accounts and link to them. You're missing out on free rewards and also discounted stuff which is silly if you genuinely spend thousands of dollars (doubtful if you think 5+ R9 GLs is any kind of boast...its not; I'm nowhere near a spender like you (passes only) and I have more than double the anount of  R9 non-req non-GL characters than you and every GL at R9).