Because this thread wasn't started for that purpose. It was started so plus sized riders could share their pictures WITHOUT fear of reprisals.
This is why not. Very well said SR. There are merits to the discussion of rider weight and horse suitability and there is no problem with starting a thread & having that discussion. This thread is just not the place for it. As general rule we ask that picture threads not be turned into critique threads, we have sub-forums for both rider and horse critiques for that purpose.
So let's keep this thread to the original intent and any sidebar conversations can be started as separate topics.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.