For all those that believe in flying saucers, other alien operated vehicles and aliens themselves.....Do you think that alien craft and technology has advanced over time in the same way that we continue to develope our automobiles and aircraft?
LOL .....From the Omegapositron Leveler 200 to the Omegapositron Leveler 3000

Hmm, that's tricky. Yeah, I guess so, after all, aliens have probably been visiting this planet longer than we've been travelling to the moon. I would think that they're always one step ahead of us, hence our not being able to 100% prove UFO sightings.

Another thought, maybe they're constantly observing us and how WE advance. In theory, if we had some 'real' contact with a life from outer space, I'd wanna know how they live BEFORE I considered cutting them up and experimenting. It could work the same way for them. Maybe they're so advanced and that's the reason why we haven't been able to prove any visit to Earth - they're able to study us from a distance? It's more than we can say about ourselves, right?

Yes! I don't think they just existed and developed their tech in one day. It takes time to build from a simple concept 1 + 1 = 2 to a complex concept e=mc2.