I'm a fan of namecheap. They do not, in my experience, engage in the same dark patterns as other registrars. I found out about their hosted mail service, privateemail, only last year. We needed something for a new business domain with very simple needs and Google Workspace would have been overkill. After using privateemail.com for the last 6 months or so, I can give it only a very basic, but positive review. It's been simple to use, reliable, and inexpensive. The plans come with Google Drive like storage, and they also appear to be developing (or integrating) online document editing which is available with their Ultimate plan (currently $68.88 per year).
We did not have any need to import mail, so I don't know if or how they support that. As far as I've seen they do not have a mobile app, but of course you can use other existing apps including the OS built-in apps. The domain is new and does not receive any spam, so cannot comment on the effectiveness of their spam filtering.