It’s got sod all to do with relationships to uphold. I’d have picked exactly the same team and as the OP rightly pointed out, that was largely the team many picked before the game, too. If anything yesterday highlighted why he was right to make 10 changes. If the second string laboured against a National League side, with all respect, then surely he was 1000% right to protect against any risk of injuries/burn out. After all, if Fleck or Stevens or McGoldrick played yesterday and got injured, who do you think is replacing them? Yep, Lundstram, Johnson, Clarke etc.
Team was more than good enough to put that game to bed but the attitude wasn’t right. Sometimes, just sometimes, footballers have to take responsibility for that rather than blaming the masseur or fitness coach for, in Wilder’s words, an ‘arrogant’ display