Several times I've attempted to respond to a comment or section, only to have my comment completely disappear after signing in.
Why is this causing me so much of a problem?
If I can't respond and maintain my position in the thread in which I'm attempting to comment, why should I bother?
I don't know. I can tell you that for some time now I save my comments (for the reason you state), so as then to offer precise examples of just exactly what was removed, when, and where, if someone volunteers to explain if, or why it happened.
I sometimes hit the wrong button and my comment is lost, so I also write comments on a word processor first if it appears to be worthy of the effort.