Of course you're right. All I've done is emphasise why I can make money at low stakes but my game doesn't evolve to beat higher stakes. Shrugging my shoulders and thinking "fuck balance, it's 5nl" might make me money against the average 5nl muppet, but it's teaching me nothing about the skills I need to beat higher stakes.

But I doubt many 5nl'ers would notice if you only cbet when you have a hand, and those that do note it and adjust effectively won't be at 5nl for long enough to rape your br.