IMHO it's less of a bother to have to open a jar and much more of a bother if you pick up a not-fully-closed jar by the lid and then have to clean the kitchen of jam and broken glass, but YMMV...
Agree. Also an issue with juice bottles with lots of deposition, if the cap is not on tight and you forget to check you end up with at best a hand dripping full of juice (if the cap was screwed on but did not seal, so you just got some liquid through the cap) and at worst a repainted wall (if the cap was barely even on, and shaking sent it flying).
