I don`t think the loss matters really too much from the fact that Poch really had a good stat in Pre-season but failed to replicate such form in the EPL even the stars players like Jackson and Liverpool Darwin Nunez failed to do well like how they perform during Pre-season, I am not judging any team or players by it this season, let see how well Man United can go when the season officially get started especially with Jim giving Ten Hag huge support in getting the players he wants.
Preseason isn't a very good time to make judgments for players or their teams because most likely you would make wrong judgements in that they may still turn out that your assumptions were wrong and not true as taught because some players can be really conservative in their preseason games only to turn out really tough in the main league games when the season eventually kicks off fully. Winning games at this point may not really matter to any team neither will loosing mean so much either because all are in preparations for the official kick off for the premier league.