LTM viewfinders are squitny because the "modern" photographer developed squinty eyesight himself.
The problem is always the camera, never the photographer, he is always the perfect creator and the camera could always be better.
As a result we've seen more crap shots from Leica M than from Leica LTM.
So, for big crap You need bigger viewfinder, parallax corrected..and easy film loading