Having spent a lot of time in the pew, as well as in the pulpit, I can say from the pew perspective, that in many cases, if the sermon is a flop, at least there’s the sacrament. And having traveled much, sometimes the sermons, even good ones, don’t particularly “hit me” on that day, although they may be something that particular congregation needs to hear. But the Sacrament “works” for me every time. This remains true even if the liturgy is poorly presented.
And I loved preaching the three-year lectionary.