Manchester United should have been ready for this match against Crystal Palace but because the death of Queen Elizabeth II made the match postponed, I think this is an opportunity for Crystal Palace to prepare the strategy used against Manchester United considering they are currently excited because of the process of recovering the standings league premiere.
Not only Crystal Palace, but all teams will definitely take advantage of this opportunity to prepare the team even better. It wasn't that long, but this time lag was enough to rearrange their strategy. Especially if the team's condition is not good, this is a good opportunity to rest and try something to apply when the game starts later.
Teams that are tired of the Premier League and European matches being played together and this intense fixture should make good use of this break. I'm sure no one likes to play in so many intense and compressed fixtures. After the Premier League starts, we will better understand how the players are making use of this break.
Yes, they will definitely make the most of the time they have. Because as you said, maybe the club or player is not very ready to face the hectic schedule, especially for a club that plays in several competitions simultaneously. This was something that rarely happened, but they got it now. But on the other hand they have to replace the postponed matches and maybe for some clubs this is actually a hindrance if they are at their best.
Maybe this postponement will be good news for clubs who still have problems with team performance to be able to improve and take advantage of the delayed schedule to train more seriously, because the busy schedule will make it difficult for them to train longer and this is an opportunity and hopefully there will be changes.
however the postponement will leave football fans around the world a bit disappointed as the Premier League game is what they are looking forward to at the weekend, but they will understand that the postponement has occurred in honor of Queen Elizabeth's death.