Those waivers and golden parrot, aren't locked to joja route, i think. People say you can meet them both, even during a Community Center run.
But i am turning Joja regardless. Achievement aside, i found the best method for my playstyle; go bundles until i unlock everything i need, get the rewards, then suddenly buy membership and buy the very last of the upgrades.
I am eagerly anticipating to use waivers, though. Prismatic Shards have been rendered way rarer than before and from more than a couple of sources. Artificial perfection for the endgame statue, it is! And if i feel like it, i might sit down to grind for crafting everything, or doing all tasks the normal way.