One thing I dislike about Football matches is there really seems to be an advantage to stacking everybody near the net if you have a lead and playing fairly boring football.
"Stacking everybody near the net" isn't nearly explaining the complexity of a successful football defense. You need to watch more football and actually pay attention to tactics. How the defensive lines move and how spaces are controlled. Movement without the ball is very important and also what you do when you win it back and where you are actually trying to win it back.
In any case it's a very risky strategy and most team don't fully apply it because they know they lack the skills. The top European football leagues all have a "goals per game" average of 2.5 (Italy) to 2.9 (Germany) so those 1-0 results are a lot less common than you apparently think.
There are teams that play terrible defensive football just trying to destroy the opponent's play. But they are far and between.
Fair enough. I'll admit that my experience, aside from sporadic matches every year, is limited to the World Cup (where scoring does seem to be very low on average). It just seems that the risk seeking team is usually not the team that wins.