Warranty is not even an issue, you can reverse jailbreak and your warranty will still be valid.
The iPad is almost not worth owning if it isn't jail broken, IMO. I could list 50 reasons why the iPad is inadequate without jailbreak but it would be a waste of time. I have no desire to convince anyone to Jb their iPad, you either do it or you don't, doesn't matter to me. I can assure you though that my iPad is much more functional as an office/business device then it is without JB; I guess if I was just facebooking and playing games it would be fine out of the box.
Agreed. The mentality is the same on Reddit on non-jailbroken subreddits. The stigma of having your warranty and insurance "voided" outweighs the benefits of the jailbreak, and that it's "extremely difficult" to jailbreak your device. Both are blatantly wrong, but it's just that the old theories and rumors became a sort of a reality to a lot of people. Jailbreaking is bad because it reduces your security. No, in fact, it's a boost to security if you have the right packages, you're less prone to malware/spyware unless you decide to open an unauthorized email or package. Jailbreaking drastically reduces your battery life. No, there are plenty of stock devices that have battery issues. By jailbreaking your device, there are possibilities of
saving yourself some battery by disabling launch daemons that are unnecessary to keep running 24/7, etc. By jailbreaking, you brick your device if you mis-tap something. No.... You can brick a perfectly brand new, straight-out-of-the-box device as well. Jailbreaking your device can open yourself to mechanisms that can help prevent bricking. All of the basic upfront rumors and fears are just people worrying over nothing really.
But to play devil's advocate, some users are perfectly fine with the basic day-to-day mechanisms of the iPad itself. Some users are fine with the basic availability of features on the stock iOS and the enhanced functionality of a jailbroken device isn't necessary because they don't feel the need to open themselves to more outlets to maintain (since jailbreaking requires maintenance). For someone that uses Android and iOS, jailbreaking is almost a must or iOS will feel extremely lacking, or for users that want a more profound experience with their device, jailbreaking is a must. That and it feels like another siphon since the must-have tweaks/packages are paid as opposed to free, hence the number of pirates and piracy repos.