Not exactly, changes should be done in a child theme, so they are not lost during update. Then after updates it’s just a simple file changes comparison and a bit adaptation of changed code if needed.

According to your replies, I assume, you are just focusing on a very basic users, not developers who are used to some common dev practices in building customised and optimised sites WP sites. I had a slightly higher hopes for such good selling theme.

Just please keep sass included, it’s very handy. If someone is not using dark theme, why to include 4000 lines, or 6000 lines of rtl support. Just by commenting these two imports I got from 980kb to 816kb and by commenting few other unused plugins to 716kb. I think I could shrink it to less then 500kb with all needed functionality for my project, which is half of the original size (uncompressed sizes, but it doesn’t matter, half is half). Same applies for scripts, which has huge impact on page rendering speed.