Sorry but your logic on the extra subs makes no sense to me. Obviously a stronger bench benefits stronger teams but won't 5 subs benefit teams with stronger squads even more than 3 subs??
It's a stupid decision to allow 5 subs anyone with cop on can see that.
The 5 subs was brought in to protect player welfare, and given the amount of injuries since the resumption, it was the right thing to do. We alone, had 2 new injured players from the first game back. Others have got injured since. It's not like international friendlies, where the subs are every couple of minutes, destroying the rest of the game.
4 subs are already available for teams who have to play extra time games. Now everyone can make a maximum of 5 subs at 3 intervals. It's not that one team can make 5 subs and another one can't. But the biggest clubs will always have the strongest squads, have better quality players available than other clubs, and will use them as required.