That's fine, and they could've demonstrated that by giving the iPad mini 3 the plain A8 chipset while keeping A8X for iPad Air 2. That would've made more sense than what they did. It's a head scratcher to charge $100 more for Touch ID alone.
I only keep two or three tabs open at once so that would be great. So long as I can have two tabs open with absolutely no reloading under any circumstances, I don't see how you could ask for more than that in such a device.