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In general, it is not done more for spectacle, in such matches often in the starting line-ups appear players that we do not see during the season, that is, coaches in such matches give an opportunity to prove themselves to new or young players, to evaluate someone and then give a chance to perform in the main matches. That's what pre-season games are mostly about
Regardless of the results of the Arsenal vs Barcelona match, I think the El Clasico match will be more interesting to look forward to. Barcelona have been beaten 5-3 by Arsenal, but they will be looking to avoid a humiliating defeat to Real Madrid in a friendly in America.
Just a few days from now El Clasico will be held, it will be very exciting for me ahead of the new season. I want to see Real Madrid play so well and prove itself not affected by the absence of Benzema. Real Madrid success to beat Manchester United in the previous match, so I also hope they can beat Barcelona in the upcoming game.