Dick Greenhaus wrote:-
"I'm not sure that naming performers when you criticize therm is a bad idea. "

Neither am I, Dick. Not that I was naming them in this case, you understand.... Not that I was at this concert - not that I have any idea where it took place. I was merely expressing the opinion that if it was Sara & Kieron, then I find what I'd label foot percussion and what others would call "thumping the floor" to be an integral part of the performance. The majority on this thread seems to express the view that as performers, they find it a useful device and part of the sound that they wish to produce and listeners understand that it is intended to be part of the overall experience.

I feel that Ross Campbell sums it up very well when he writes
To some people, it's just an essential part of the whole performance. Of course it's possible for a listener to focus on something they find annoying, to the detriment of their personal experience - but that's what it is, a personal distaste - I doubt if anyone else noticed.