What I would say about those four is that they were all from relegation-threatened teams, or literally from the Championship in Trafford's case. I was all willing to trust the club on Trafford, but in any other circumstances, the idea of a multiple title-winning team looking to the league below for their new first choice goalkeeper would be insane.
Grealish more than held his own for a good while at the club and was an important part of the treble-winning squad. I didn't for one second see him playing in the Champions League and think he looked out of place in the way I have with some others.
What I'd say about Anderson is that he's being widely praised for his performances this season. Who out of the other players you mentioned were being hyped up when we bought them? Trafford, sure, but with the caveat that it's the Championship. And Grealish, who was the most successful of the ones you listed.
Wolves fans were pretty shocked when we bought Nunes. Kalvin Phillips had a bit of hype when he did well for England, but by the time we signed him, the hype had well and truly died down and it was a bit of a surprise if we're being honest. Ait Nouri, likewise, was always on our radar, but I think most people were like, "Oh yeah, him" when his name came up in left-back conversations, rather than him being the first name on everyone's lips.
I think all of these signings are very different to buying players like Anderson or Wharton, who are widely considered the next big things in English football, and more akin to when we bought Stones, Walker or Sterling.