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I recently had to think about the same issue. The rule of thumb that I decided to apply was that if I only had css changes then no need to run a child theme. However, if you need to edit a theme page file (or several) then you should run a child theme (with your css and edited theme page files) and delete the your css plugin.
Of course there is also the argument that everyone needs a child theme because it is good practice to have a customized 404 page. If you agree with that view then perhaps you can run a child theme with a custom 404 page and your edited css. You can then delete your css plugin.