I get what you mean, they have played alot, but I think going in the opposite direction and just telling them to rest for multiple weeks is too far in the other direction.
For example, the PSG was May 4th, and Newcastle is May 14th, 10 days is a HUGE amount of rest between games, they basically did get a break. Then they can rest against Brighton and play Everton which would be a 9 day gap, plenty of time. Then 6 days until final.
Pep might rest again though, who knows what he's thinking or what the science says, but my thinking is that the gradual approach is the best way to manage their legs.