But I think that going over a game, even if it doesn't have commentary, provides a couple of benefits:
1.) It will give you new ideas that you may not have thought of before. Maybe you'll see some interesting shapes. When you are in a common situation in a real game, maybe the move you saw is not the correct move to play, but at least you've had exposure to the move, and you can consider something like it.
2.) Even if you investigate the position and come up with the wrong reasons, the investigation in itself is still worthwhile, in my opinion. You might be wrong about something, but at least you can exercise your mind in thinking about it.
That said, guidance from stronger players - pros especially - may lead one into the correct direction more quickly than you might have on your own otherwise.