On the subject of bands not being allowed to change their tune in later stages of the panorama competition

On the subject of bands being not allowed to change their tune in later stages of the panorama competition ,I hate being a contrarian, but even if it was allowed in the past, that rule makes sense to me.

Because it’s not just the band that got the judges nod in the preliminaries and semifinals, it was also the tune and the arrangement.
Changing the tune obviously neutralizes the judges scores, and returns us to square one, since the new tune has not been graded.
It’s almost like an entirely different band!
How do we know that the new tune would have made it past prelims and semis ?
Just because of the name of the band and arranger?
Is that fair?

And one more thing, it would complicate the judging even more, with more controversy, if multiple bands did it.
And that is always a possibility in such a competition if doing so produced a winner.
Allyuh know how we Trinis like to “follow fashion”!
I can certainly foresee such a situation.

Some of the top bands are so powerful and popular , it is quite possible for them to make it past the prelims and semis with a relatively average performance.
So it will be feasible for them to use one tune as a sort of “placeholder” , and retain their real tune as a sort of “bomb”, to be dropped on finals night.
It would then be an entirely different competition.
Because everyone will copy , and also try to do it if possible.

I think the rule is a good idea.