In Chakirah, the flatbush journal of halacha vol 23, Ari Greenspan wrote a whole article on the discovery of coffee and halacha.
Initially, thee rabbanim banned coffee houses along the lines of stam yaynam.
But this ban didnt hold. Personally, i'd like to see stam yaynam be repealed.
Halacha evolves, in journal #19, Ari + Ari trace the history of matza showing they were soft and that shruya (gebrochts) is a modern problem (Alter Rebbe / Ba'al Hatanya notibaly)
Aye so lets talk Mesorah, eat soft matzas! Do shechita with nikur etc..
While not my thing, there are those that wear "techelet" a mitvas asei m'dioreisa.