I found this interest, read it on article. There has been many a discussion about leaving starters out there but yet average innings pitched has only gone down by 1 IP
In tandem, starting pitcher use has dropped. Starters have averaged just under 5 1/3 innings this season, down from 6 1/3 innings in the 1980s. Their pitch count averages 85.7, down from 97 in 2010
https://sports.mynorthwest.com/mlb/seat ... ng/1816617