I wouldn't be surprised if they did this if they didn't leave games at 7 innings all the time.
https://www.espn.com/mlb/story/_/id/29004498/mlb-union-focused-plan-allow-season-start-early-arizona
https://www.espn.com/mlb/story/_/id/29004498/mlb-union-focused-plan-allow-season-start-early-arizona