Carbonate posts and pages look great on both desktop and mobile platforms. It’s designed to be completely responsive and easy-to-read. The content comes first before design.
With Carbonate, you can use both the Classic and Gutenberg editors in WordPress. On this site, I’m using Gutenberg, but only really to test.
On all my other sites, I use the Classic Editor, which you can install via a plugin, and I would recommend it. It’s just better for writing. Blocks, in the Gutenberg editor, are better for designing. But the goal with this theme is to put more focus on the content rather than the design. And it’s also lightning fast!