I don't know if it's fair to say it's like previous S phones...it doesn't do other S models justice, the ones which were significant upgrades
Consider the iPhone 6S from the 6, which was a pretty significant upgrade. Pretty much everything other than the design was improved upon in a significant way, the same cannot be said of the XS over the X which overall has less improvements, and the ones that are there are comparably more minor ones
I agree with you though, your point stands - these devices are intended more for the people who are on that 2 year or older upgrade cycle
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Not significantly, no. But the camera is better. Are photos important to you? Do you take many pictures and videos? If so, then get the newer device. If you aren't a huge photographer or videographer then the X should be just fine.
If you're looking to jailbreak, the X will be your best bet but it will have to be a model that is pre-iOS 11.3.1
No XS or XS Max device (or any device with iOS 12, that includes the X if you get one used that is on 11.4 or greater) can be jailbroken yet
