The priest is the servant of the liturgy. His tastes, personality, and style come through in his homilies, no doubt, but the topic is generally determined by the readings (not necessarily, but normally).
While the homily is now considered part of the liturgy, it hasn't always been so. Before Vatican II, the priest's homily was considered separate from the liturgy. This was symbolized by his taking off the chasuble (or if not that, the maniple on his sleeve) to indicate that the homily was simply this poor soul's attempt to expound on the scripture readings and not divinely instituted like the Mass. So even his persona was "checked out" of the liturgy as he rose up to preach. Yet another example of how the church put Holy Scripture above mere human attempts at commentary.
I, too, like the ebb and flow of the liturgical seasons. It's much like the seasons of the year (Winter, Autumn, etc...). Feasts and fasts. Much like life.