I feel like PentaxForums is a skewed case study to determine the prevalence of the aperture failure problem.
There have been many, many camera units that have been sold that have been deemed 'snake-bitten'.
If one is unlucky and gets a dud, one seeks solutions... PentaxForums would come up in the first 1-3 hits on Google, I am sure. The unlucky folk voice their issue on the forum and posts slowly stack up over time to the point where it may look like every K-50 ever sold is going to go black... But when scaled to the rest of the many, many units that have been sold, I believe it is not as prevalent as looking through the PentaxForums lens would have one believe.
My K-S2 has been brilliant. Super jealous that the K-70 came out shortly after - would love to own one (maybe one day)

---------- Post added 08-29-20 at 07:04 AM ----------
Originally posted by reh321
I have a KP, and I will always say that the KP is a better choice
curious, if I may ask:
If the aperture block problem never was - would you still recommend the KP over the K-70?
They have near the same feature set..
But the K-70 has a bigger grip, control wheels in more regular locations, and a fully articulating LCD screen.
All for "$200 USD" cheaper...
The odd grip alone is personally enough for me not to want to shoot a KP full time, love the look of it though!