"Matt Barrow"
I suspect a lot of pilots have filed and flown IFR flight plans with
little more than some IR training. This may be another such case.

Evidence? Reasoning?

What part of the word "suspect" don't you comprehend?

Your question begging definition skills precede you. What do you mean by "a
lot"? Or "some IR training"?

Aside from that, my evidence is NTSB reports I've read and that about one
driver in ten on the roads do not have valid drivers licenses; which is
more likely to get caught, driver or pilot.

Driver. But flying approaches in IMC with "little more than some IR
training" would likely result in lots of accidents. And I don't see any
evidence of this. (Departure or enroute IMC with an assured VMC destination
would be less problematic. Pray that a diversion isn't needed.)

moo