> There's a variant of going full stack where you eat your way gradually through the customer by doing all their hardest work for them.

One of my clients provisions front office applications for banks and the conversation has come up more than once regarding the client evolving into a bank themselves and building up operations around the capabilities of the product stack.

One good multi-regional partner and it could be a radically different animal. Providing software to one very big customer tends to be a lot simpler than providing it to 20+ smaller customers.