I think this is due to two factors:
1) No kid grows up dreaming of being a RG. Big kids would rather play in the DL because there is glory in sacks and TFLs.
2) Spread offenses in HS and college don’t require linemen to hold blocks
According to the metrics that everyone loves to trot out to prove that the Bills are really bad at run blocking, the Browns have the best pass blocking line by a mile.
Because intentional holding to kill clock is a 15 yard penalty and they put the time back on the clock:
https://www.google.com/amp/s/www.sbnation.com/platform/amp/2017/3/28/15066542/nfl-rule-prevent-team-burning-clock-repeated-intentional-penalties
Because you can’t do that since 2017:
https://www.google.com/amp/s/www.sbnation.com/platform/amp/2017/3/28/15066542/nfl-rule-prevent-team-burning-clock-repeated-intentional-penalties