We do involve 2nd string players in the cups, but we play stronger teams than any of the other top 6 teams. Its one of the reasons we've won one and are in the final of the other I suppose. Eg, De Bruyne, Aguero and Zinchenko all started the second leg of the semi final when we were 9-0 up. Why?
In the early rounds of the League Cup, KDB did his knee in the 86th minute of a game we were winning 2-0. It wasn't his only injury this season and we've done very well without him, but because of that particular injury, he missed the defeats to Chelsea, Palace, Leicester and although he was back for Newcastle he wasn't fit. We might not have had to effectively rest players in the 1st leg to Tottenham because we HAD to beat Palace. All sorts of ifs and buts going on there I know.
I'm not advocating trying to lose in the League Cup, but I think there are at least 10 key players I wouldn't let be in the squad for any game of the League Cup prior to the Final. If the fringe players and youngsters can get through great, but if they can't, so be it.
You're probably right because I thought I'd made peace with it when Barca won the first leg 3-0, and we were still top of the league, but my disappointment has re-emerged.
Having said that, my disappoint is over the last 8 years, not just this one. We should have done better.