Just like in the real world, you will most certainly run into instructors with varying levels of knowledge.
It's actually fairly amusing to watch some know-it-all CFIs profess to be ultimate authorities and not understand fundamental aerodynamics. Or, even simpler, I had an instructor tell me I could and should log <50nm xcs as xc time towards my private rating. Something like that you'd think they'd have down cold. Or some of the wonderful OWTs floating around in aviation that only perpetuate because people won't think for themselves.
Driving instructors get in accidents, too... and may not know how to use a timing light.