It doesn't benefit us more than the status quo.
If 3 subs means more injuries (it will) then we have the depth of squad to cope with those injuries, while Sean Dyche will be putting out a 4 man bench (2 keepers) by New Years Day.
We can lose Aguero, Bernardo, Mahrez, Sterling, Laporte, Stones, Fernandinho, Walker and Mendy and we'd still be able to put out a team of top 4 quality players.
At its core, 5 subs rewards smart managers. It gives a new level of tactical flexibility, it increases the effect a manager can have after the game has started.
The teams who really suffer from 5 subs are teams who put all their money into a starting XI and have a massive drop off in quality on the bench. If you have a good quality bench, then even if that's just a midtable quality matchday 18, you will benefit from 5 subs.