Decentralization doesn't mean hosting your own instance. It's about open protocols. There are hundreds or thousands of email providers that you can use and still send an email to a Gmail user without hosting your own instance.
> + There is almost little to no one on Mastodon to talk to.
I have found that this is an accurate description of the first impression one gets; this is not true, but we're all so used to recommendation algorithms easing discovery that the impression is equivalent.
The one that can't be bothered to say "Hey what's your Mastodon handle" to like 500+ of my friend group on Twitter where is the main Mastodon instance is closed.