Pentax don't seem to think loading a camera manually is going to be too difficult for people.
I have never encountered these people that cannot load a manual film camera.
It is hard to imagine there could be any easier film loading than a 35mm SLR. On the electromechanical SLR with powered film advance, all you do is pull a bit of film out, and the camera does the rest. But even on the fully mechanical and manual SLR, the procedure is very simple to learn.
Actually, it seems like the 17 has some sort of easy-loading implemented, where the film just needs to inserted until a dot, similar to some late 90s SLRs.
Regarding film insert mess up: I use film since about 30 years, and from time to time I still manage to mess it up: a new to me camera has a slightly different setup then I am used to (rolling backward or forward? how far in), or when I use bulk rolled I cut the leader the wrong direction and a bad angle which leads to problems.
When I was new to manual cameras about 15 yrs ago (after cheap point and shoots as a kid and AF SLR a bit later), I didn't know I had to press a button underneath to unlock before I can rewind, of course I ripped that film, and instead of realizing it I opened the camera when I though I was done...
Last summer I managed to not insert a film on a half-frame correctly, which I realized only very late in the roll that the re-winding lever doesn't turn. Happened years before on a different camera as well, I should really look at the rewind lever...
In one camera, I had the film block after a handful shots, and I still don't know if it is (a) the camera's fault (should try with a non-bulk rolled film), (b) my bulk rolled film or it's cassette, or (c) something else which is my fault. I got the film out and the first few shots looked good, but of course the rest was empty (on a bulk rolled short film where I was already not 100% sure how much shots I actually get out. One of these films ripped also in the camera, no idea really why)
And on a 220 (new to me...), I aligned to the first dotted line instead of the full line with arrows a bit later on the roll, so 1-2 shots wasted on the leader.
I guess if I stick with one camera, I don't mess things up. Otherwise I might... Most of the time I am fine though...