That can be true when the problem is that the transaction fees are high, but sometimes (particularly when there's a slow block) they're unstable. So you might place a 6 sat/byte transaction fee on your transaction with the expectation of a 90% chance of "within the next block", but the next block comes out 35 minutes later and it's stuffed full of 10 sat/byte transactions. So you end up bumping the fee with CPFP and the transaction takes an hour for the first confirmation instead of 10 minutes.
But I wasn't talking about that. I was talking about the even rarer cases when no blocks get mined for an hour or more.
