Almost all browsers will import everything from other browsers. Believe it or not, it's the easiest thing to leave. Gmail is the hardest, and will take a lot of time and effort, but it's well worth it: Alternatives are outright vastly superior.
The special sauce that makes it better is iCloud custom domain emails. Now I can have mynmame@lastname.tld email. If you ever want to jump ship again to new provider - you don't have to worry about changing your email, you can just migrate the DNS records.
If it wasn't for custom domains, I wouldn't recommend another tech giant, but I feel like this is a special combination of control && integrated ease of use.