Maybe I have to rephrase it to be more precise: most people I talked to over Signal, at the time of writing the article, would complain that they hear themselves when talking to me
I tested it in January with a Huawei phone and the issue was fixed at the time see: Add Fairphone 3 to AEC blacklist · Issue #10466 · signalapp/Signal-Android · GitHub
But I got other complains later. As I recently updated to Android 11 I would have to try again.
I totally agree with you that most people who write reviews are those with bad experience, that is exactly why I wanted to raise my voice with my (mostly) positive experience, but still I didn’t want to hide the negative.
I actually would like to edit the original post, because I solved e.g. the fingerprint issue by putting a clear tape over it and registering the finger multiple times, now I use it all the time.