Who puts their speakers right up against the back wall and why?

People place their speakers up against the wall mainly because the speakers (several models) were designed to be used that way. Other people do it because their wives demand it as an ultimatum for the continuance of their marriage. It’s called the WAF or Wife Acceptance Factor, which basically means it’s much more important that she be happy than you.

AN speakers typically (not always) sound best corner loaded.

Boston Acoustics have made some speakers designed to be placed against the wall through the years. We had a pair in a fairly small room (years ago) and they were quite enjoyable.

As I recall there have been Linn speakers that were supposed to be used against a wall 

For sure the Ohm Walsh speakers a must against the wall