Kinda frustrating software engineers largely keep using heading tags like it's 1996 and we're all just working on our little hobby sites. Screen readers and other software use those heading tags to determine document structure. Yet we're still picking them based on default browser styling!
One of my biggest industry pet peeves is that JS engineers will spend hour-long meetings debating shit that should be in a linter anyway, then just know fuck all about HTML and write semantically incorrect slop.
The idea that HTML is "easy" and not important to think about, or look at and leave feedback on in code reviews, is part of what's keeping the web from being more accessible. As the Internet's user base ages, however, I think more will care. Most people have to be personally affected to care.