Well, I do like to play the Wild Mountain Thyme in 4/4 (like the Scottish Tourist Board advert) and the shaky egg works well on that.

But I also play the egg myself and I know the damn thing is a challenge - it can be really hard to moderate to the song.

Likewise I also play a bit of bodhran, and it can be a very major challenge to work with normally unaccompanied singers (and beware of the frowns which may mean it was the wrong song to join - usually I wave the instrument at an unaccompanied singer and wait for a nod before starting) because where thay can pull the rhythm on a voice, it just sounds like you've made a mistake if you do it on the drum.

I usually find keyboardists helpful - but I know some do not.

Mostly I play guitar and mandolin and/or sing (sort of) and quite like people to join in, but it does involve the joiner being able to do it. I'm quite uncomfortable about exclusion, but if you are the principal performer of a song or tune and "accompaniment" is putting you off then the accompanist is in the wrong - unless it was one of those sessions where house rules were that everyone joined in, in shich case it was your choice of material that was wrong.