\begin{rant}
• When people say they're "not skilled enough to fix the code" most of the time it's "did not try hard enough"
• On the other hand, my general feeling is that most answers here are code-only (plus possibly the screenshot of the result, but the most important part -- code explanation -- is missing)
→ but perhaps it's not that bad, it's mostly "search for \usepackage in the answers, lookup the packages on CTAN, read the documentation to see what it does, manually resolve the `\expandafter` (ugh) ... as long as you know you need to do that, but it's not at all obvious.