So anything that does not impact the scoreline is of no importance? I'm not sure if this is your point, but it seems a bit wayward if so.
Secondly, there is this myth on this website that long shots, and shots that don't change the scoreline do nothing for a game. If a team or player, (like Willian for example) has hit the post twice in quick succession, it forces the opposing team to prioritise closing down said team/player, thus freeing up other space and players.
I'm not implying that it a purposeful tactic that Willian just used, or that it is a game changing moment (though it could potentially be), but I'm simply implying that just because something does not directly influence the scoreline, does not mean it cannot influence the result.