I don’t agree. They’d make upwards of 7 changes for those matches and would be better rested for the League. All top managers enjoy having good opportunities to start the guys they have no real intention of starting in the league.
They will play a total reserve side in that competition.
Playing reserves and making changes doesn't actually matter. It still ruins your entire week. The manager & squad still fly across Europe, you lose 2 days travelling & 1 day playing.
If they went out of Europe, they'd have 5 days training before a league game. Sunday is a rest day, and then you get Monday-Friday to focus on 1 game.
If you're in Europe, you get 1 day to prepare for the next league game - or 2 days if it's a home european game.
Also it would push them onto Sundays, which means we go ahead and they're then under pressure to keep up.