`gauge` option suggestion

Dumb question:

Looked at your flow. Yeah it is great. I've already said that.

But "pulling it apart".

Mind if I ask why/how/where the ui control node fits in?

I got curious and deleted the link from the ui control node. The flow still works.

I don't get how it fits in the scheme of things.

It isn't I want to put you on the spot. Just if you could please help with me understanding that part.
(I can ask in the forum, but just feel it would be polite to ask you first.)
Is it ok if you don't want to help if I ask on the forum?