Same. I tried really hard to quote properly, because I was so annoyed by the top-posting mess that everyone else did, and it frustrated me that people would add you to an email where you need to read 100 things that came before it (with increasingly garbled formatting) to understand what was going on.

I felt people were unwilling to take the responsibility for communicating properly, and so they took the easy route where they could shrug their shoulders and say "I included all the context."

I only ever got complaints from people who were confused by the quoting style or didn't know what the email was about. I'm not sure if it's still true, but at the time, Outlook didn't use threaded view mode by default and most people didn't know about it. FWIW I work in manufacturing and not in tech, I expect the level of competence in tech is a little higher, though I also hear how people moan about having to learn the tools they use every day, so maybe there's little difference.