Earlier quoted context omitted.
The downside is of course that Stripe takes over more and more of your important infrastructure. A question should always be how to include several suppliers and/or how to change supplier in order not to put all in your eggs in a single basket.
The cost of letting Stripe do all the work than moving over to another provider is extremely costly and can damage sales. Unless your provider really sucks, it's always important to evaluate carefully and ideally stick with them unless it is really that bad.
Yes, that's exactly my point: At some point you are completely locked in with a single supplier that holds your entire income stream and perhaps even more than that.
Ideally (easier said that done, I know) you want to have at least 2 suppliers for any key piece of infrastructure as early as possible and to avoid letting a supplier 'expand' the number of tasks they do for you too much.
The latter seems to be Stripe's strategy: They start with payments then expand step by step in everything related et even in things like company incorporation.