Earlier quoted context omitted.
> There's no good reason to I used html for years. Once my email volume reached a certain point, I went back to plain text because I can read it and respond to it much faster.
Neither you nor the poster provide a reason why. Why is it better? How does plain text make it faster to respond? Or even faster to read?
With top posting, in order to read a mail - especially one that is a few levels deep in a thread - becomes an exercise in jumping back and forth, trying to find context and make sense of who replies to what, finding relevant sentences (often hidden in a mess of signatures).
With bottom posting and proper curated quoting, context is a glance away, and it's easy to see who said what in reply to what.
I'm sure this would be possible with HTML mails as well, but I've never seen it happen. It's all just a mess of hard to find information in the least sensible order imaginable.