West Ham won the europa cup, Man City just won the champions league . England has just dominated the European comps so there’s no justification for it
There was only one replay involving a Premier League team last season.
22/23: Fulham beat Sunderland in the replay.
There were no replays in the previous 2 seasons because of Covid.
2019/20: Newcastle hammered Rochdale in the replay,
Tranmere beat Watford in extra time, Tottenham beat Middlesbrough comfortably, Newcastle beat Oxford, Liverpool beat Shrewsbury.
2018/19:
Derby beat Southampton on penalties, Newcastle beat Blackburn in extra time,
West Brom beat Brighton in extra time, Wolves beat Shrewsbury.
2017/18: Leicester beat Fleetwood,
Wigan beat Bournemouth,
Norwich beat Chelsea on penalties, West Ham beat Shrewsbury in extra time, Huddersfield beat Birmingham in extra time, Swansea annihilated Notts County, Tottenham beat Newport, Swansea beat Sheffield Wednesday, Tottenham annihilated Rochdale,
2016/17: Newcastle beat Birmingham, Crystal Palace beat Bolton, Southampton beat Norwich, Liverpool beat Plymouth, Leicester beat Derby, Man City destroyed Huddersfield.
So in the last 5 seasons involving PL replays, there have been 26 replays, only 5 lower league teams won those replays (in bold), and only one did it in regular time.
Only two of those clubs were from a division lower than the Championship.
The lower league clubs would have just as much chance of winning in extra time of a one-off match.
There have been absolutely loads of giant killings in that same period, so I'm not seeing how replays have added significantly to the chances of the underdog getting a result.
Quite the opposite, it largely led to the Premier League team saving face, and on the rare occasions where they did win, it's largely because of the extra time that the replays had prevented in the first place.