When I started reading this thread and it clumped trumpet technology/sound in a 50 year grouping, my mindset was as if I was reading about something historical, antique, distant past. Then I realized that last 50 year clump wasn't in the historic, distant past. It was within my lifetime!
I most certainly agree! I started playing in 1966 over 50 years ago.
Unfortunately, we only have audio documentation for the last 100 years or so. The instruments in museums and in the hands of very gifted players however are showing the 50 year turnover on style/construction/technical possibilities. I do not have instruments from every epoque, but I have natural trumpets from the Rennaissance, early baroque, late baroque and classical periods. I have valved instruments from around 1880 to very modern Monette. Even the approach to playing these instruments is different.