Deleting and renaming classes without routine

@Emmanuel Thank you very much for your detailed answer.

I am not a developer and I come from the world of no-code platforms, also I don’t know anything about the peculiarities of developing such complex applications as Pinegrow.
I can only compare Pinegrow with other visual editors and give my opinion.

My suggestion in the post (link) was not to change the logic of working with selectors towards automation, but to provide a choice.
Why not let the user customize Pinegrow by himself using the menu you see on the screenshot?
removeClass
rename Class

This is just my fantasies, I’m not a UX/UI designer, I can’t evaluate how usable this would be. But it seems to me that with such a choice, people who create simple and small sites will be able to work faster due to automation, and those who thoughtfully develop complex projects will also get a choice in selector management to optimize development.

I don’t know how difficult it is to develop and maintain such a solution, but it seems to me that many users would love the provision of choice. You can even set up a poll if you want to know what users think.