There's all this blank space to the left of the comment. Some of that could be used for bigger arrows.

Or some of the buttons on a comment could be hidden until you tap the comment. (And you can do it in CSS if div toggle is an offensive amount of javascript.)

There are some low-hanging fruit that would make the experience better. It's fine but it's not great.

The Octal app has better touch targets on mobile and manages to show more text at the same time. Here’s a pair of screenshots from my iPhone of the top of the “Is Rust Faster than C” comments. [0] is mobile Safari, [1] is Octal. The app shows more text.

This is exactly what makes me nuts about this whole debate: the complete lack of empiricism or nuance. People would rather just have their knee-jerk outrage about JavaScript or web design fads, instead of actually checking whether the things they’re saying are true.

[0]: https://imgur.com/a/aOvLFcM

[1]: https://imgur.com/a/7R14m4d

The font is bigger in your first example, the text uses twice the space (or your screenshots are different resolutions?). I greatly prefer it because it's easier to read. You could zoom out if you want, I guess.

But you could move the arrows to be to the right of the [-] and space them out a bit, sure, so they're easier to touch.