I don't think it is irrational ot madness at all. Imagine having to switch developers and then you ask for analytics from your new developer. Very easy to happen that they could forget about the cookie banner.

I would go as far as to say it is wise to deal with it once and for all.

Especially since implementing the banner takes such short amount of time. Worrying about it will waste many times more brain cycles and once again there is always a chance someone forgets about it in the future and legal worries will be infinitely more costly.