History of Siddur
Question
I was recently told by smeone that the early forms of Siddurim only contained the Shema, blessings of the Shema, the Shemoneh Esrei, and the Aleinu, and the reason for the addition of the other blessings, the Verses of Praise, Ketoret, etc, were added not only in order to help one fulfill his required daily Torah study, but to fulfill the requirement of saying 100 blessings a day. Is that true?