I like the new concept

Me too, one of the few redesigns that appear to really make sense. They also use space so that it works well on desktops, not one of those pages just optimised for phones with 80% whitespace on a large screen.

I feel I would still want to use Inbox over this redesign, although having calendar, notes, and tasks right on the side could be very handy

I wish they would allow one to resize the compose window.

are they going to leave Inbox project in the future?

I’ve been looking to use another emailing service. Suggestions?

Fastmail is superb. Their web UI is super slick, very responsive, and above all, quite functional.

Support is also really good, and that's something that's really nonexistant in many providers.

ProtonMail https://protonmail.com

Did you use that? Can you talk about your experience with it?

So much white space....

Why?

Google was a proponent of whitespace before it even was a thing. Remember how empty it looked compared to ask.com or yahoo.com?

IMO the white space gives a bit of a breathing room without compromising too much. I also like the emphasis on the todo list, which has always felt like a second class citizen up until now.