I can only speak to my personal experience and friends with the newer phones...
The cameras in anything newer than a X, are significantly better with regards to low light conditions and much much sharper. If anyone cares, that's a decent upgrade... if you take a photo in any dark conditions, you will notice this difference immediately. Usually that's a solid differentiator between a good and bad camera.
As far as processor speed, I have my X connected to carplay and it consistently skips, lags etc... i compared to a family member's 11 Pro and it is flawless... so I do think the Ram and CPU upgrades must be quite large.... also i would never complain about a newer battery.
If you are a basic user, maybe it doesn't matter to you as much. I would say, if you have an 11 Pro or newer, skip. Anything below that is worthwhile.
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2 x N54 -> 1 x N55 -> 1 x S55-> 1 x B58
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