I work in the optical industry. I do R&D/quality control for a lens manufacturer and agree Luxottica is an awful company, but your comment is way off base. It's actually quite wrong.
Your "zyl" acetate frames aren't higher quality. Modern acetate is stronger, lighter, less brittle, less subject to warping from temperature change, and more resistant to UV damage which impacts brittleness and color. 40 years of material science progress. No one in the industry would say older acetate is better. It's worse in every way especially because yours are old. They're breaking down.
People don't wear glass lenses anymore for a reason. They are heavy and the only advantage over plastic is less chromatic aberration which is a non issue unless you are comparing to an extreme prescription using high-index plastic. They are also fairly dangerous compared to plastic due to the way they shatter. They fog up more easily. Again, 40 years of material science.
Additionally, there are no low optical-quality plastic lens blanks. This is a solved problem. The only defects you'll get in lens blanks are bubbles and these won't make it through production. What happens after a manufacturer grinds the lens out is a different story but I can also tell you that their lens surfacing is not low quality by any means.
Your hinges aren't any better and get loose over time. You can't actually use these for 40 years, they will wear out too and are harder to replace. Spring loaded hinges are lighter and reduce strain on both the frames and the wearer. I know what they use, they aren't cheap, and are high quality.
I do agree with your point on the branding.
The optimization for optics is all about weight. Your old frames and lenses aren't better because they're heavier, they're worse. As well as being more brittle and shatterable. It's like pining for the old heavy golf clubs made of wood and iron or all steel cars with V8 engines. Yeah, they're heavier! But they're worse in every way.
I will also say that you should buy frames because you like the frames. If you want great lenses, you just get them made. You shouldn't expect high-quality prescription lenses from a frame manufacturer, that's what your optometrist is for. I buy cheap frames all the time and pop in whatever I want.
You may have a bit of a point if you are talking moderate to high prescription ordered from Ray-Ban, but if you are talking about their non-prescriptive sunglasses, you're just yelling about all the wrong things.
Edit: typo and swapped in "surfacing" rather than "production" for clarity.