Wayne, could you be speaking of the cultish Pentax LX in your post? Here is a camera that was perhaps once worthy of the devotional status it still enjoys, but that now is something of a crapshoot to buy used for the near-certain problems that have developed over the ensuing years (even sitting in a dark closet, the seals and mirror stops go bad). Any number of parts are no longer available new for it. Even back in it's heyday, parts were proprietary to Pentax, and pretty much by extension so was service and tech specs. (Same will be true for more recent and complex cameras. Nikon F5s aren't something your neighborhood repairman will want to touch, this too from the personal experience of such rejection).
Someone just starting from scratch might have sort through several examples LX bodies to find a good one that's either been serviced and done right or doesn't need any. I went through 4 used ones myself to find a good replacement for my original Pentax LX purchased new back in '86 that survived much abuse for more than a decade without any service whatsoever. Any 20+ year old camera body so well-loved, however, can be expected to have "major issues".
Not just every manufacturer made ultra-small rugged and/or weather-sealed bodies that were intended to be system cameras. Nikon, Minolta, and Canon never did, strangely enough; Pentax, Olympus and Contax did, as mentioned. Most of the truly tiny ones have no sealing (Pentax MX & MEs, OM1s readily come to mind) and their circuits may not survive even one sudden downpour.
But you can't look at camera bodies in a vacuum, one needs to consider the real-world availability of lenses in the focal lengths needed. Canon and Nikon lenses are common enough as to be readily available, even the acclaimed and legendary ones. Now, it seems what everyone always mentions first about the Pentax line is that there's a ton of K-mount glass available. Yes, there is-- magnitudes greater quantities than Contax Zeiss or Oly Zuiko lenses-- but the K-mount was generic to several brands (Chinon, Sears Tower) and much of what is found are aftermarket consumer zooms of mediocre quality. The Pentax A* lenses, SMC-A 100mm and 200mm macros and and the legendary Pentax wide primes (18mm f/3.5 K-mount, 24mm aspheric) are themselves now all cult lenses, originally made in extremely low quantities, rare as narwhal beaks with auction prices to match. Good news is that while these get all the buzz, the garden-variety Pentax SMC-M and SMC-A manual focus prime lenses in the range from 24mm to the normal 50mm are almost without exception stellar performers. These will be the lengths most often used in landscape in 35mm format, so there is no liability to choosing Pentax here.