The past twenty years, corn hybridization has gone, wild , literally. I get seed catalogs where new varieties of sweet seed corn, still just have a laboratory number, no name. I planted one such F1 variety this year.
With the mergers and extinction of so many old seed companies, some fairly new hybrids have disappeared as money people said they did not make enough money.
Now hybrids are just that, you do not plant last years seed for this years crops, cost money , time and space to make new seeds.
AT that:
When I was pre-double-digit young boy, my grand parents both who were farmers (and few farms did not have dairy cows) grew a variety call Trucker Favorite Yellow Corn, it was technically a dent corn, but was sweet enough that picked at the correct stage it was quite edible as sweet corn. ( It was often used pre-dent stage to feed the cows, and had a nick name - Cow corn.)
GrandMa or GrandPa would go out to the field , pick a dozen, put a lot of sugar, and some salt in the boiling water and boil it for 15-20 minutes. It was great with a large dab of butter and more salt.
When GrandPa quit milking, GrandMa got a job at the Glencoe Green Giant during summer sweet corn processing, she came home with a bag of Green Giant sweet corn at .50 a dozen so no more Truckers Favorite sweet corn suppers.