Is there some sort of insurmountable tech debt over at Apple that requires these slow rollouts and long development cycles? They announced Pay later at WWDC 202

Is there some sort of insurmountable tech debt over at Apple that requires these slow rollouts and long development cycles? They announced Pay later at WWDC 2022, and it's just now releasing, and the Savings account was announced in October and would be available "in the coming months", but is only just now (likely) coming out - and given Pay Later is still limited release, I imagine the savings account feature will be as well.