picking a 2019 cayenne on tuesday and they are trying to sell me on the tire and wheel insurance, and simonize glass coat...would like to hear different opinions on this...

thanks

As you said, it's insurance, and you are paying the insurance company to share the risk. It's your call about what that's worth to you.
That said, it's a Profit Center for the dealership, and you can probably drive a hard bargain to have them throw it in the overall deal at somewhere around half price. Use it as a closing tool - "I'll buy if you throw it in."

Bought both. Replaced two tires already and repaired one wheel with curb rash. So it has paid for itself already.
Won’t be able to tell about the windows until it warms up.

I'm usually the guy that never buys the add on insurance but years ago a friend told me to get the tire and wheel protection. Six years later and 6-8 tire replacements, I'm glad I did. But I'm also in a large city with a lot of construction. Lastly, do you have all season tires that can be patched or are you going with a lower profile that's best not to patch? As far as coatings on a car, it's your call. I'm a fan of a ceramic or polymer sealant but you have to be careful who applies and what they tell you. I have found that a paint/glass coating will typically last 18-24 months if you keep your car in a garage. (They might tell you 3-5 yrs) It's a coating (like wax) with a longer life and a bit different shine. Some people like it and some do not. Like wax, it will not prevent rock chips/door dings/etc. And of course, you have to maintain the paint/glass/wheels with a quality soap, proper towels to dry, a detailer. spray. Again, some people enjoy this and some don't. I'm not familiar with simonize but at Hennessy in Atlanta, they treat their cars with Resistall. I've had 3 cars from them and my 6 yr old car looks like it just came off the showroom floor.

thanks for the advice i did wind up buying.. i think it was the right move...

So, I think it is not so necessary and this is just a new way of Porsche how to earn easy money. I'll ask your question from Money Expert guys. I'm always ensuring my cars there and I know that they are not trying to trick their clients. I remember how 3 years ago I had a car crash and my Insurance Company paid me all compensation very quickly. I think that their management and attitude to the client is very right.