learning how to control your bike without the assistance of being attached to your pedals is pretty darn helpful. I would not call lifting your pedals "cheating" at all, but relying on that attachment allows you to become complacent. you might hate it on trails, but practicing some maneuvers on flats could be worth the time spent doing so. I have no problem bunnyhopping over logs on the trail with flat pedals because that's how I learned to do it when I was 12. if you can't get both tires off the ground without being clipped in, you're denying yourself a useful skill that will open up a lot of options on the trail. some people say they can do this because they are clipped in and that's all that matters, but it's not the same thing and I can't explain to you what that means until you experience it for yourself.
I just highly recommend learning to control the bike with flats and learn how to bunnyhop up onto a curb, at the very least. It will do wonders for your experience on the trail when you apply those skills to a bike with clipless pedals.