The substitutions changed the dynamic. Little threat after that so Villa were able to settle and push up.
Exactly this. And this is a recurrent problem, which is by no means unique to Wilder. Wenger used to do it frequently towards the end of his time at Arsenal when he stopped winning things or beating the other top teams. The similarities of an otherwise innovative manager with a brilliant footballing team anachronistically taking off his best ball players and attacking threats in favour of 'muck and bullets' to see out a game, are striking.
So many managers believe that they are tightening things up by bringing on a defender, when in reality, depending upon which player they take off in order to get the defender on, they often actually undermine the shape of the entire team to the extent that it comes under far more pressure than would otherwise have been the case.
Last night, we removed a player capable of getting hold of the ball in midfield and keeping possession, to get a defender on. As a result, we weakened the midfield dreadfully because, for everything good that Basham brings to the team at wing-back, he is simply not capable of getting on the ball and keeping it in midfield. That's why he's not a Championship midfielder. Pushing him into midfield 'to give us legs in there' or to 'break things up' is such a backward and flawed approach which is completely at odds with all the positive and innovative things that Wilder does as a coach.
The consequence is invariably that we fail to keep possession and the ball just keeps coming back at the defence.
For 75 minutes last night, the defence was barely threatened. Villa hadn't had a shot on target. After the substitutions, though, Villa managed to play higher up the pitch and ask a few questions of the defence and, although some Blades think that we have a decent defence (based on statistics), I maintain my opinion that it is a brittle defence but, fortunately, because we are invariably on the front foot, it rarely gets put under pressure. When it does, it panics. That's why we keep seeing that teams only need a 5 or 10 minute spell in a game to score against us.
Last night, Wilder could take Dowell off by all means, but in doing so he absolutely had to get Duffy on in his place to get on the ball and keep it from coming back into our defensive third constantly. Had he done so, the opportunity for the individual errors to occur probably would not have even arisen.
It really is a blind spot amongst all that is new and exciting about what Wilder and Knill do, and it's costing us plenty of points as the same thing happened at Rotherham and at home to Stoke, for instance.
Of course, it didn't happen in League 1 or even at the beginning of last season, when, in fact, we started to build a reputation for our ability to manage a lead through to the final whistle by playing possession football (various videos on YouTube attest), but then we had Coutts getting on the ball and playing one-twos all around the middle of the park and totally dictating the tempo. He did it this season too in a cameo against Hull when we easily saw out a 1-0 wiin.