"Its a good reason never to buy a nexus rear hub"

How so? Because it has nuts, not quick release? Because you have to remove the shifter cable before you can remove the wheel? Unless you also got a roller or coaster brake, removing a Nexus wheel is a split second longer than removing one with cassette and quick release... and that's even doubtful once you get done futzing a quick release wheel out from the chain/derailleur clusterkcuf. Even with a brake in the hub and an extra connection to undo, I don't see a flat with a nexus hub slowing you down too much more than a couple extra minutes with a flat. Complete non-issue unless you don't like carrying an extra tool (15mm/adj. wrench).

Saying flats are a good reason not to buy a nexus hub equipped bike is just like saying flats are a great reason not to be riding in the first place.