Every era is full of chokers and players that are good enough but since the beginning of time the dominating athletes have had 2 aspects in common great Serve n forehand or great forehand.
The bh based players were always seen as chokers or inconsistent.
Gonzalez-laver- Borg-Lendl-Sampras -fed- nadull all fh based players . Some have great serves. U have to take the initiative , your options under pressure is wider as well.
Second fiddle players of the era. Rosewall/Connors/wilander/Agassi/ Hewitt/ nalby/Murray etc. their bh more reliable than fh generally.
Conditions have a lot to do with it as well. Hewitt would get destroyed but del-po on HC but Hewitt was able to beat him at Wimby why did he suddenly get good no. The surface and speed of the court played an important role.
? I agree with your general point, but Laver is a pretty major exception.