Very obviously and the Spurs game is all the evidence you need to know. 0-0 going into extra time, Tamworth could have nicked it before the final whistle. Extra time starts and on comes about £100m on talent in Son and Kulusevski, with Solanke brought on 3/4 of the way through the game when he obviously wasn't planned to have been used.
What happened? Spurs are three up in 25 minutes and Tamworth are out. This is exactly why replays should be played - Spurs have a huge squad and can cope with additional games, it's just an excuse to protect the bigger teams.
Another example Liverpool, look at their squad players like Nunez, Gakpo, Bradley, Kelleher, Tsimikas, Elliott - I'm sure these players could all play an additional few games per season alongside a handful of u23s.
Everything is set up to protect the moneymaking clubs, look how United were quite literally assisted by the Premier League to get around the very rules they tried to relegate us for.
Replays should be reinstated, but I've no faith they will be. Probably some rule will come in soon where a select handful of clubs, probably Liverpool, United, City, Chelsea and Arsenal, all get a bye directly to the fifth round on account of 'historical success' in the competition.