Not that this is  a direct answer,  but we had something like automotive glass in the original aluminum framed windows on our Mk1, and the leak factor was a PITA.   Replaced with frameless glued on acrylic windows about 5 years ago, no leaks, but they are more prone to scratching.    

I don't think you would want real glass which is what automotive glass is.  I have an auto glass business, and when that stuff breaks ( all windows excepting the windshield) it will shatter into 5 billion pieces.  It could be as simple as a halyard getting loose and swinging into it, a mis-placed heavy step under way, a dropped tool etc.  You decide, ascratched or crazed piece of Lexan or a hole where a piece of glass once lived?  No thanks on glass.

Technical spoken you can have good laminated glass panels, but these are quite expensive compared to Lexan.
I consider that for the business case the manufacturers are aiming for a good margin, high selling price and cheap to purchase / manufacur.

Our 1986 C30 main cabin side windows were glass in aluminum frames. The opening ports were all acrylic or Lexan. We had a 1982 Cape Dory- all the opening ports were glass set in bronze frames. So....it can be done.....I'm sure more expensive designs than just plastic withou any frame.