It's a fair point, but in the first half we were struggling to create chances more than anything. The kindest criticism of the sub is that it was basically like for like in terms of where McT came on to play, which was as the DM. This, despite the fact it's become very obvious that he's much better for club and country as a goal scoring 8.
It didn't really make sense and failed to address the real area of weakness which was in attack, especially down the right, where both Antony and AWB were having poor games. I don't know what was wrong with AWB, he didn't seem to have any energy at all.
The more obvious sub at HT would have been to bring Reguilon on so Dalot could switch to RB and Antony would have had more support, or taken Antony off. Even if it was for McT, maybe tried Bruno on the right for a bit before Amad. Or gone really left field and tried something different, like Bruno/McT dovetailing as a sort of false 9 and Rashford LW and Garnacho RW. Even if it didn't work, we could have seen he was trying to find a solution to the lack of options available to him today.
Instead, he made a nothing sub and we actually got worse in the second half. I'm not sure how much McT was to blame for both their goals, but it certainly looked like he should have been closer to both goal scorers.
Eriksen also had a poor game and shouldn't have lasted the 90 mins. His inability to track back also cost us and probably made McT look more at fault than he was. Perhaps Eriksem should have gone off at HT instead of Mainoo.