I see a lot of exercise reccomended ITT, but just remember that it takes an hour to "burn" 300 calories walking, but under a minute to eat a donut. Dieting is your battle. Also, doing a little exercise (5 min walk) everyday that you can keep yourself doing consistently is WAYY more important than the 2 hour gym sesh you hit twice then get demotivated and never do again
(This is coming from someone with no experience losing weight, so take it with a grain of salt)
I agree with you overall. One benefit of exercise, is it increases your muscle mass. Which generally increases your overall metabolic rate. Which means throughout the day to maintain that muscle mass you are burning more calories at rest then if you hadn't developed that muscle mass. So there is benefit to generating muscles for the sake of generating muscles
I go road cycling a lot. That burns more than 600 calories an hour. Just one 3 hour ride per week offsets almost as much calories as eating in one day does.