I have gotten several comments on my scores saying that they would be better if I had regular or at least even numbered phrase lengths. But what is the point of say sticking to 8 bar phrases for a composition? There are plenty of phrases which are an odd number of measures long. You don't have to look any further than Beethoven's 5th symphony to find a phrase like that.
This is the opening phrase of Beethoven's 5th. As you can see, it is 5 measures long. It also sounds like a question and answer in octaves, with the answer still being incomplete until the second phrase enters and the motif is developed. So you could say this phrase is a period within a sentence that is itself part of a theme. I have tried sticking to 8 bar phrases and I find that because the last 2 measures of an 8 bar phrase are expected to be cadential, I find that my creativity as a composer goes down and I rely more on modulation than on rhythm or anything else that is important other than the notes themselves when I use regular phrase lengths. Is it really worth it if sticking to 8 bar phrases means my creativity lowers?
And even if it didn't have to do with my creativity, is there really a point to sticking to even numbered or regular phrase lengths when you could easily get the essence of an even numbered length phrase in an odd numbered length phrase by simply shortening the cadential part of the phrase?