"The argument is whether this "Catch all form" helps."

With respect, I'm not sure that's correct. I haven't seen much discussion of that. Most of the argument has seemed to start from the presumption that this form is, or may be, compulsory for all events, and that it's excessive, intrusive and inappropriate. The first is (for the time being, anyway) incorrect.

As for the second, for some types of event it may well help. I don't know whether a law-abiding promoter of the type of event which this form is clearly intended for finds this form helpful or not - and we're unlikely to get an answer on this forum. However, no one's given an example of it being applied to the type of events this forum is interested in - on the contrary, someone was advised that it wasn't required for a singaround.

Neither has anyone given an example of a licensing authority making it mandatory for all events. So far as I can tell, it seems to be used selectively (and for all I know, voluntarily in some cases) for those events where it may actually help to prevent crime.

At the moment, there seems to be a danger that a lot of folkies and jazzers are making a fuss over something which doesn't directly affect them, and isn't intended to. Our objections are therefore likely to be dismissed out of hand. I agree there is a danger that it may be extended unthinkingly to cover our sorts of events, but are we doing ourselves any favours by knee-jerk opposition to something which is intended to keep law and order?