Even with so much uncertainty at United with Rooney's transfer saga continued and Moyes inability to bring an established player to United, it is a comfort for Manchester United that Robin van Persie has slipped back seamlessly into where he left off last season – scoring goals, winning football matches and demonstrating, with great finesse, the art of centre-forward play.
The man who scored 30 goals in his first season as an Old Trafford player will not be allowed to carry forward the two he managed here into the new season because the Football Association does not regard it as an official fixture. He has, however, delivered another reminder of his gifts, and a timely one, too, given the complications that have confronted Moyes in his first summer in the job and the negativity surrounding Rooney's ongoing attempts to cut himself free.
Van Persie, in this form, is a source of great optimism for a club in dispute with their other main striker. The Dutchman needed only six minutes to lift the mood with the expertly taken header that put United on the way to a steady win and, though his second took a deflection off James Perch, Wembley had held its breath in anticipation as soon as Van Persie collected the ball and turned inside, with the clear intention of letting fly. This is the sight that excites United's supporters more than any other these days. It is also the sight opposition defenders must dread the most.
On this evidence, it is clear why Rooney has misgivings about his position in the order of merit at Old Trafford these days. Van Persie was not always prominently involved on a day when his team-mates had plenty of the ball but, collectively, did not always do a great deal with it. His contribution, however, was still decisive, from the moment he launched himself off the ground to meet Patrice Evra's left-wing cross, applying power and precision to send the ball just inside Scott Carson's right-hand post.
Level with the penalty spot, Van Persie was in the territory that would ordinarily be considered too far out to score with a header. Yet the timing of the run, having sprayed the ball out to Evra in the first place, then the leverage and ability, mid-air, to pick out his spot was wonderful.
It was a stodgy performance at times from United and, after such an encouraging start, probably a surprise to some extent that the Premier League champions did not emphasise the gulf between the two clubs more emphatically.
Yet they did play with a sense of control against willing but limited opponents. Michael Carrick dictated the tempo in that elegant way of his and Ryan Giggs, now into his 24th season, gave a distinguished performance mainly in a more advanced position than usual, interchanging with Danny Welbeck just behind Van Persie because of Rooney's absence and Moyes's determination not to over-exert Shinji Kagawa.
Wigan, now of the Championship, are going through an experimental time, with a new manager of their own and a host of different players, and they were fairly obliging opponents. Owen Coyle's team will look back on a couple of reasonable chances towards the end of the first half, first for James McClean and then Emmerson Boyce, but they never managed a shot on target and struggled on the whole to find the fluency that is associated with them on the good days.
Grant Holt made a couple of heavy connections with Nemanja Vidic, and vice versa, but David de Gea had about as easy an afternoon in United's goal as he will face all season.
More than anything, Wigan did not seem to have the belief they could cause an upset that was evident against Manchester City in the FA Cup final.
The disappointment for Moyes will be the hamstring injury that meant Rafael da Silva featured only for the first quarter of an hour before Chris Smalling was introduced and Phil Jones switched from centre-half to right-back. The Brazilian could be out for five weeks and Wilfried Zaha was also limping when he left the pitch in the second half after a lively yet raw performance. Zaha had been precisely what you would probably expect: eager to get on the ball, showy and unpredictable with some crowd-pleasing tricks and fast, direct running, but a player who can also be frustrating, rough round the edges and needing work.
Zaha went off shortly after Van Persie's second goal, starting off a flurry of substitutions that indicated both teams knew that was the moment the game was effectively finished as a contest.
Evra, often playing as an auxiliary left-winger and with plenty to prove as Moyes pursues Leighton Baines at Everton, was involved in the goal again, the ball being worked left to right via Tom Cleverley and Welbeck until Van Persie latched on to it and immediately set about working an angle to shoot.
The ball flew through a congested penalty area, flicked off Perch and United had won the Community Shield for a 20th time.
Unofficial or not, Moyes will have enjoyed getting his hands on a trophy.