European clubs spend their summers playing in American stadiums, and those matches are broadcast and analyzed as though they carry information. Almost none of what makes a competitive result meaningful is present.
The purpose is commercial before it is competitive
Tours exist to reach supporters in markets where the club's broadcast and merchandise revenue is growing, and the fixtures are arranged around cities rather than around opponents.
Match fees and sponsorship attached to a tour can exceed what the club earns from several competitive home fixtures, which determines the itinerary.
Coaches accept this because the alternative is a training camp with no revenue, and the physical work can be done in either setting.
Selection makes the results meaningless
Squads are rotated wholesale, often with entirely different elevens in each half, so no combination plays long enough to establish anything.
Young academy players fill out the squad because senior internationals return late from summer tournaments, and the lineup may not resemble the one that starts the season.
Substitution limits are relaxed by agreement, which means the closing stages are played by players who would not otherwise be on the field together.
Physical condition is deliberately incomplete
Preseason is a training block, and players are frequently competing while carrying accumulated fatigue from heavy sessions rather than being rested for the match.
Intensity is managed rather than maximized, with running loads planned in advance and players withdrawn on a schedule regardless of the state of the game.
A team that looks sluggish in July may simply be at the deepest point of its conditioning work, which is the intended state at that moment.
Conditions differ from the competitive season
Matches are played in summer heat and humidity that European domestic fixtures rarely produce, and often on surfaces installed temporarily.
Travel across several time zones within a short tour adds a fatigue factor absent from any competitive fixture the club will play that year.
Crowds are large but neutral, containing supporters of both clubs and of neither, which removes the home advantage that shapes competitive matches.
What can be learned anyway
Tours do reveal structural choices: a new formation, a young player being given repeated minutes, or a signing being tried in an unfamiliar position.
Those are decisions rather than results, and they carry forward into the season in a way that the scoreline of a July friendly never does.
The reliable reading is to watch selection patterns and ignore the score entirely, because the coach was making choices about September while the broadcast was reporting a result in July.