Wolves and Leicester already have very accomplished midfielders, who’d walk into the United team; the fact they’re not in for him is no indicator of his ability. It’s worth noting Longstaff dominated Neves and Moutinho when they played against him.
Chelsea have a transfer ban, Arsenal have a minimal budget and bought two very good midfielders last year. Pep naturally went for the tapas option in Rodri, Liverpool have a lot of depth in a Champions League winning midfield and will likely only reinforce it with a more attacking player like Coutinho or Eriksen.
Spurs got Ndombele, a deal they’ve been working on for 18 months and consumed the majority of their budget; there’s literally nobody else who Longstaff would want to leave his hometown club for, especially if he’s been aware of United’s interest for a while under the radar.
If he had a Dortmund shirt on spraying passes about like that, the sceptics would be buzzing about the prospect of signing him.