Interestingly enough, I was listening to Rav Schachter’s shiur online last night right after reading this thread. (Mods don’t let links to YUTorah, but it’s titled Shiur #21-Yevamos-Chazara under R’ Schachter.) He quotes that some people still hold that we are all Amei Ha’aretz Bizman Hazeh (because no one accepted to become a Chaver in front of 3 Chaverim) and that he was once by a Rosh Yeshivah in E”Y who wouldn’t give him anything that needed Terumos and Ma’asros taken off because no one can trust anyone else Bizman Hazeh for Terumos and Ma’asros.
It is one of the Brisker Chumrahs. I’ve seen it in practice, and have posted it before IIRC.
Also add to you list Pesulei Eidus, etc. from ????? ?? ? that yitayningwut posted.