They never did it completely by-hand. Maybe GMs in Vanilla would fuck around with players more but there's no way anybody knows whether they still do this.
(Side note: Are you actually nostalgic for the way Blizzard "used to" handle botting? Christ.)
They banned people for buying gold before the token existed. They are banning people for buying gold after the token has been implemented. They're never going to stop people from buying botted gold completely but they can do things which make the allure of botted gold less enticing.
Considering my argument has never been that the token stops botting, I really don't know what you're getting at here.
Do you want to know what the real solution to botting is?
It's for Blizzard to completely rewrite the entire fucking game from the ground up with the knowledge of how botting works. It would also require the complete evisceration of the add-on community because they'd have to disable the ability for players to use lua. It would need to be a kernel-level strategic upheaval unlike anything Blizzard has ever undertaken before. We're not talking Cataclsym world revamp, we're talking rewriting every single line of code in the game in a way that prevents botters from being able to use software. In all likelihood, such an endeavor would cost Blizzard more money than they'd spend if they were to just develop a completely new MMO from scratch. And even then, there would still be incentive to create bots because WoW's virtual currency is able to be exchanged for real world currency.
This is a losing battle. The purpose of the token isn't to eliminate botting, it's to diminish the impact of it. It's to discourage people from using cryptocurrency-adjacent botfarms to generate WoW gold as a "side hustle." It's to make the game safer and more secure for the average player by not forcing them onto websites run by actual fucking criminals. That's the purpose of the token. And yeah, Blizzard profits from the token -- at no point have I ever denied this -- I just think the net positives for the game outweigh the net negatives.