I've only once enjoyed buttermilk pie and that was at the home of a woman who was researching recipes in hopes of authoring a buttermilk pie cookbook. I don't know if she ever did, but she should have; she could do anything in the world that interested her: earn advanced degrees in math, build houses, make furniture, etc.
Her pie was beyond delicious amd I still muse about it from time to time. I'm surprised buttermilk pie has not caught on and become popular, but they are rarely made around here and are nearly forgotten.
I've been thinking of tracking down the would-be-pie-author to ask for her favored buttermilk pie recipe. If I do and she shares it, I'll post it here for all to enjoy.
Now, we're excited about sugar cream pie. I've never heard of such a pie, but hope to try one before long, since they're made in nearby Indiana.
We occasionally had vinegar pies when I was growing up, but I wasn't sophisticated enough to enjoy them. I was one to bargain with mom for cherry pies. Now, rhubarb pie was different. We had them in season, both pie and cobbler. They were great.