What happens if I turn Gsuite off and still use the custom domain for email?
PS: I used to be fan of zoho.com but I also gave that up.
There was an "Ask HN" regarding your question: https://news.ycombinator.com/item?id=30004468
And then another large thread with 1K+ comments about the topic in general: https://news.ycombinator.com/item?id=29996432