I'll give you a serious answer as I feel like if I don't your head might explode:
In the long run it may be a tool to benefit bigger clubs with deeper squads and keeping more players happy.
As of August 2021 we have just come off the back of a very long season + Euros / Copa / Olympics whilst still dealing with COVID hitting squads. For example, Mainz at the weekend are missing more than 10 first team players due to COVID so had to rely on the youth team so having extra subs to deal with it really helped them. Until things get back to normal I am all for giving more players rest.