If your scrap rate is 50 %, then you're not experimenting enough. I get rid of about 90+% of the non-technical shots I take, which gets me results that I'm happy with at a given moment (over time I tend to spot more faults in the pictures I kept, and I have to fight the urge to retake them).
On the subject of old photographic gears, I find that the rendering of films is much easier to reproduce than that of old lenses. In this day and age of computer-aided optical design, manufacturers strive to perfect their lenses and remove all possible optical aberrations. That may make sense from a technical perspective, but that trend only makes lenses larger and heavier (more elements) and the photographic output more clinical. There's nothing quite like a strong spherical aberration and some parasitic light reflections from imperfect AR coatings to give some character to your pictures
All that discussion about photography makes me want to write a post bout electronic flashlamps... I may have an idea for an interesting and unusual lamp.