Earlier quoted context omitted.
I'm going to use this space to complain that there's still not a way to delete single messages on Android instead of the whole thread. This is possible on the web, and I've been asking Gmail for this simple function for years, yet they continue to avoid adding it in.
Just curious, why would you delete a message on a thread? Here is my Gmail on Android workflow: I swipe to right and archive the thread after I read the thread. It goes away from my inbox. Once someone adds a new mail to the chain thread re appears in my mailbox. I read it and archive it again. I rarely delete a mail.
I find that using Gmail with mailing more than X people is impossible because the replies all get mushed together. I now change the subject line for individual replies so I don't get lost.