For its intended use case of formatting hypertext, HTML isn’t as convenient as Markdown (for example), but it’s not egregiously cumbersome or unreadable, either. If your HTML document isn’t mostly the text of the document, just with the bits surrounded by <p>...</p>s and with some <a>...</a>s and <em>...</em>s and such sprinkled through it, you’re doing it wrong.

HTML was intended to be human-writable.

HTML wasn’t intended to to be twenty-seven layers of nested <div>s and shit.