I don't see why that's needed. Nothing wrong with two teams being tired after 90 minutes. Might actually make it more likely to end the stalemate with more errors and less running
I mean why not 2 extra subs, or 3?
It was fine before. This change does not make it better
A fresh player has the potential to spark some life into the game then, rather than expecting it to just spontaneously occur with the same 22 players, no?