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This would be a pretty reasonable comprise in my opinion. Works like mail bridge (maybe calendar could get some love too?) And everyone is happy.
It's not fancy like an automatic folder sync thing, but at least I could mount a Protondrive directory and do my own syncing myself (I'm a Linux nerd afterall). There is no need for "deep filesystem integration" as he claims.
The same thing could be used for Calendar with Caldav feed as well. A single "Bridge" app could me made to handle Mail, Drive, Calendar
That would be my dream.