!As with the increase in subs, there's only one group of teams this benefits. The Sky teams.
You're never going to see City/Liverpool time wasting when they're 1-0 up against Burnley/Luton, so the time added on will be 3-5mins.
However, imagine Luton are 1-0 up at Anfield and doing everything to run down the clock. Liverpool bring on 5 fresh players (half of the outfield team). Luton have their backs against the wall and instead of frustrating and clinging on, the game goes on for an extra 15mins. It's likely that they'll find a way to score at least an equaliser.
The squads that the Sky teams possess are in a different league to the majority of teams. They have a ridiculous amount of options and now they're being given another helping hand, to ensure those games where they were frustrated and dropped points won't happen again.