Yep, it would be a huge mess. This is what lead me to switch to Fastmail. If it's _essential_, it's probably worth paying for to ensure you have real support.
It just so happens that Fastmail is also puts out an excellent product.
Fastmail is excellent, but for business purpose… they lack Google Docs, Meet, Drive, Chrome (so you have to create a Google account anyway if you want to save your Chrome bookmarks) and being the major SSO provider on the market.
Separation of concerns is a positive, in my book - I don't want my personal email to be mixed up in my file storage and document creation. I guess I'm old school like that.
It just so happens that Fastmail is also puts out an excellent product.