On: We made our SaaS home page cookie-free

[virtue3]

Lawyers would argue that it might be a good idea to put up a sign if your neighbors have a dog that could attack them.

(weak argument but somewhat funny).

Lawyers are ultra cautious. If you can -guarantee- that no one is going to magically add tracking/google analytics or some such to your site than sure, tell them you don't need the banner.

[mewpmewp2 → virtue3]

I would say big picture wise it is wiser to add the banner unless it hurts your conversions.