Indeed, I have noticed a tendency recently to play really "funky"
tunes. Personally, I'm all for variety in music—I'm cool with
anything from violins to electric guitar to djembes to glass
harmonica—but if I can't follow the phrasing, it's a lousy tune to
contra dance (or waltz) to, and I'm going to think much less of the
band.
This has been especially problematic with waltzes at the Concord
dances I've been to recently—I'll guesstimate that 20% of them are
just not good to dance to. As an example, one recent tune had an
extra half phrase, making the downbeat shift and causing me to think I
was leading with the wrong foot all the time!