A setup built on someone else's logic is a setup you do not fully control. You should be able to explain, without checking, which mailbox you use for what, where your domains are registered, what aliases exist and why, and what you would do if your primary password manager became unavailable. If you cannot answer these questions, the system has grown beyond what you can defend. Build according to your own thinking. The structure that makes sense to you is the structure you will actually maintain.