A heavy win produces the most goals and often the least watchable highlight reel. What an edit needs is uncertainty, and a blowout removes it early.
Goals stop carrying information once the result is decided
Each goal in a close match changes the state of the game, and the viewer's understanding of what is at stake updates with it.
In a lopsided match the later goals change nothing, so they arrive as repetition rather than as developments in a story.
An editor is then presenting several finishes in a row with no reason for the viewer to care differently about any of them.
Defensive collapse makes the finishes look easy
Teams several goals behind lose shape, and the chances created against them come from disorganization rather than from anything the attackers constructed.
Goals scored into that disarray read as unremarkable on video, even when the finish itself was clean, because there was no visible resistance.
Which is why the standout goal in a big win is usually one of the first two, scored while the game still had a defense in it.
Crowd sound flattens as the margin grows
The audio of a stadium reacting to a goal that seals a rout is noticeably different from the reaction to one that breaks a deadlock.
Editors depend on that noise to give a sequence weight, and thin crowd reaction leaves the images without support.
The away support falls silent entirely, so one side of the acoustic picture disappears at exactly the point the goals are most frequent.
Editors compensate by changing the structure
Packages from one-sided matches often abandon chronology, leading with the best goal rather than the first, because sequence no longer carries tension.
Some are cut as a montage of a single player's contributions, which gives the edit a subject when the match itself has stopped providing one.
Both approaches acknowledge that the raw material is a list of events rather than a narrative, and that a narrative has to be imposed.
The best packages come from tight, low-scoring games
A match settled by one goal gives an editor an hour of near misses, a decisive moment and a finish where the outcome was in doubt throughout.
That structure maps directly onto the shape of a story, and the goal lands with weight because everything before it established the difficulty.
Which is a reason to be suspicious of judging a match by the highlights available: the most watchable edits often come from the least eventful games.