I don't think I explained it well.
It's good that you can select different units of measurement, but that's good for the output in CSS but not in the DOM, in the DOM the output should be: <img src="/images/logos/logo.svg" height="60"> and not <img src="/images/logos/logo.svg" height="60px">
Although it's true that its immediate solution is not a priority, it should be solved along with so many other DOM code validation errors.
A company asked me to validate the DOM code in W3C, it's using Helix and SP Page Builder, I started solving this and was going to put the list of everything here, but I don't see any opening to receive collaboration. On the part of SPPB it generates HUNDREDS (yes hundreds) of warnings for adding the <style> tag inside <div> despite having Production Mode activated, I think you should also take a look at that, ultimately the product is yours.
Best Regards