1) Berachos 35b - R'Sh'b'Y' says Efshar Choresh Bishaas Zriah ... Torah Ma
T'hei Aleha. But donsn't R'Sh'b'Y' himself say in Menachos 99b that
ViHagisa is satisfied with Kriyas Shma Shacris and Arvis?
2) Berachos 34b Rav Kahana Chazif Al Man D'mefarash Chetei. Rashi says
because of chilul hashem. Tosafos says because it shows he's not
embarressed. What about because if people hear about it, they will
assume "everyone does it" and they will commit such sins too?
1) Excellent question! Tosfos Rabeinu Yehudah ha'Chasid answers that Raban Shimon Bar Yochai's statement in Menachos is referring to the minimal learning required by law. His opinion here in Berachos, on the other hand, is referring to the ideal .
2) What you suggest is indeed a possible answer, and is probably included in Rashi's explanation, that it is a "Chilul Hash-m."