Looking at if a shot troubled the keeper doesn't reflect a chance quality though. Could be a great shot from 30 yards out, or could be a sitter that misses the net. XG is a stat like any other stat. Yes of course watch the games. This is a stat like any other that is used to quantify certain things. Our attacking stats have been shit this season, but we've also finished well below xG. So you'd expect it to even out, as it tends to do that. Which means if you have a bad finishing run, you'd expect to eventually have a good finishing run. That's common sense, but quantified. Likewise, if we are conceding 20 shots per game but have conceded 10 goals fewer than our xG against, you would expect to eventually get battered unless you address the issue that's leading to leaking chances. Getting away with opposition missing chances doesn't mean you defended well. It's just getting bailed out.
Is it not better to simply keep the ball, not let the opposition get in your box, rather than risking some random crosses, corners or shots against? That's what big teams do. That's what good teams do. It's nothing about Pep football or possession obsession, it's simply do the basics. Don't concede chances.