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Please note that I am not attacking wezterm here, my criticism is aimed to be constructive because terminals are important. I think wezterm is a very cool project, and I wish all the best to it, but why not make a terminal that actually (correctly) implements those escape sequences? (We are talking about a couple dozen controls here.) Given the development history (3+ years, 3k+ commits) I would say that this is not a resource issue but a prioritization issue.
For an example of a GPU-accelerated terminal with much less polish, less unicode/ligature support and less portability, but one that takes fundamental correctness very seriously (coupled with excellent performance and very low latency) in a tenth of the source code and (presumably) a mere fraction of development resources spent on it, take a look at zutty. Note, if you like wezterm, you will probably NOT want to switch to zutty, because it's a much more basic program.