I agree with you that Man UTD were exceptional in yesterday's game, they literally destroyed the defense of Bournemouth making it look as if their opponents were amateurs. This is their second winning, won West Ham and now Bournemouth. Before the game, I thought that Bournemouth would present more challenge to them than the one West Ham did and considering how the Cherries stressed Man UTD last season, it further made me believe that the Red Devils won't get an easy one but with an early goal from a struggling Rasmus Hojlund, my confidence in Bournemouth started to drop.
It's interesting that Man UTD didn't slack in their pursuit for dominance after the first goal came in, rather more goals kept coming in and it made me wonder whether this their performance is like a prelude to what we'd see in the coming season or this is just a flash win.
This is just a pre season friendly match. We have seen Manchester United performed very good in pre season matches in the past and crumbled during the season. It's good that they have won two premier league teams in their pre season matches, but hope they can win them where it matters. I would prefer them losing in the friendly matches and win in the league matches against these two teams they have played so far.