When you instruct the people, O bishop, command and exhort them to come constantly to church morning and evening every day, and by no means to forsake it on any account, but to assemble together continually.... For it is not only spoken concerning the priests, but let every one of the laity hearken to it as concerning himself. 
Clericalizing the Divine Praises by obliging clerics and only clerics to pray them is imbalanced and contrary to the true spirit of liturgical prayer. Clergy are not properly thought of as those who pray in the place of or instead of the laity. This mentality weakens the communal and public celebration of the Divine Praises. Rather, the clergy are to lead the laity in prayer.
An example of the clergy celebrating Vespers together with the laity