Joseph
“ubiq: My point is that even the examples given are not examples of anything that there aren’t large frum communities that *do* keep them.”
Yes, but WE don’t. thus they are examples of “mitzvos that we don’t do anymore even though we technically coukd. ” I agree they are NOT examples of mitzvos that NOBODY keeps anymore. I’m sorry that that confused you.
“To be birchas kohanim biblical we need two kohanim which we might not have every day”
Mazel tov! So you have a 4th reason weaker than the already weak reasons described by the Aruch Hashulchan as “אין שום טעם נכון” I’m not so sure what that adds.
NC
“No matter the reason, people who do it keep 6-7 on the regular clock; not shaos zmanios, not converted for standard time or daylight savings time, etc.”
This is true for some, not all. At any rate that deosnt change the fact that those who keep 6-7 doesnt really make sense (especially when you consider that if FLA adopts DST year round, so the the State governemnt will change when Mazal maadim is sholet, but only in their state? Not impossible, just strange.)
See seferYisroel VeHazmanim for details regarding this minhag
“Unmarried bocherim still fulfill the mitzvah of tzistzis.”
Nu nu its a machlokes you and the MB 17: 10 who says regarding the Maharil הוא דבר תמוה דעד שלא ישא אשה יהיה יושב ובטל ממצות ציצית
If you dont like the example though I do understand.
“Also, who said duchaning on weekdays is a halachah?”
The Torah
I’m not sure what you mean. It is a mitzvah deoraysa. there is a reason why Kohanim say ” …asher kideshanu bemitzvosov…vetzivanu levarech as amo Yisroel…” Ramabm lists it as a mitzva