Reply To: Chidushim on Daf Yomi

ברכות יא,א
Certainly if a person can do both mitzvos the same time like wearing tzitzis does not exempt him from doing other mitzvos, so we are talking about not being able to do both. Asks the Ritvo in Sukkah 25,1 why would we think we should need to interrupt the mitzva we are doing to do another one? He answers that once you start doing a mitzva the other mitzva becomes voluntary and you are not allowed to do the other before you finish the one are doing. As the Shaagas Aryeh says that a derabonon is considered voluntary next to a
doraysa,
You can start doing a mitzva even though the other mitzva will start in the middle of the first mitzva and we don’t have to interrupt what we are doing e.g krias shma.