Tbf that's how most people outside professional scouts will judge players. My opinion on Nkunku is mainly from watching one or two highlight videos, in that to me he looks similar to Rashford pre-injury and so wouldn't be a good fit at United. Not a great dribbler, but fast, good finisher and passer. Obviously could be wrong.
Havertz and Werner I think are a better fit for Chelsea and Tuchel than Tammy. Werner imo is a better fit than Lukaku even.
The one player I did actually watch a lot of matches for was Sancho, and I was strongly of the opinion that whilst he was very good, the space in Bundesliga and his inability to beat players from a standing start at pace especially in the CL would cause him issues at United. Seems like our scouts judge players on completely different metrics to most people.