I’m pretty sure nothing in NATO’s articles explicitly requires a joining state to have their territory secured, at the very least article 10 says nothing about it. I believe it’s hypothetically possible, if consensus exists among each member state, for them to grant membership to Ukraine, for Ukraine to immediately call on article 5, and for the United States and everyone else to militarily intervene immediately. It’s just that in reality no one wants that to happen.
Oh shit the seatbelts are a great example, I’d maybe add that typing on a keyboard is another thing that feels habitual. Everywhere else the 3 month rule applies pretty well in terms of maybe picking them up and randomly immediately dropping.
Can a neurotypical chime in and say whether seatbelts and typing are habits to them like brushing teeth?