That's got nothing to do with why we haven't done well in the competition.
What your advocating is burning out the squad in a potentially 50+ game season.
We need to build a competitive squad for four competitions. Not put the same squad in all four competitions and then moan at them and the manager for not succeeding.
Vicario
Porro - Dragusin - Van de Ven - Udogie
Bergvall - Bissouma - Donley
Kulusevski - Veliz - Johnson
Is more than strong enough to beat shitty little teams from Greece and Austria. It doesn't even have to be that team, Donley and Bergvall can rotate and you add Sarr or Bentancur in there too. I imagine van de Ven won't play each time either. If you don't want to start Veliz, then sure start Son or the new striker we bring in the summer. And tbh, rotating full backs is also crucial, they get through alot of work.
But it's absolutely imperative we make sure of our squad is used in this competition. It's draining.
Taking that competition seriously isn't just about playing your strongest team. It's about having the right mindset and mentality for the competition.
Sure, get to the latter stages and begin to use your stronger eleven. But you need this squad to be match fit and match ready for all situations.