HTML is bad. The language itself feels unintuitive and is clunky compared to modern markdown languages, and let’s be honest, your webpage just consists of nested <div> tags.
My websites do not consist of nested divs. Your webpages might just consist of nested divs, but only if you are clueless about what you’re doing and are oblivious to basic stuff like accessibility support.
CSS is bad. Who knew styling can be so unintuitive and unmanageable? Maybe it made sense 25 years ago, but now it’s just terrible. It’s very clunkily integrated with HTML too in my opinion.
Being unmanageable is the output of the developer team, not the languages they use. Decoupling Presentation from the data and semantics never ceases to make sense. CSS has many issues but the way its integrated with HTML is certainly not one of them.
Frankly, you sound like you blame your tools a lot.</div>