Wolla

Must say - after 8 years since it’s release, it sure does look like the X-S1 has been banished into obscurity. This is quite sad.
Being long in the tooth by any standard, it still creates astonishingly good results if you take the time to get to know it and thus get the best from it.
I had a X-S1 around 2012 to 2014 and used it a lot. I really loved it and together with the X100, I felt I had all my photographic needs covered. Then came the Sony RX10 and on paper at least, it made a lot of sense, so I sold my X-S1 and got a RX10. My X100 developed SAB and I gave it away and later also got a RX100M3 when I wanted to travel light.
I’m primarily a .jpg shooter, so eventually the Sony color processing got me down down and I sold both the RX10 and RX100M3
I recently stumbles upon a cheap X-S1 and got it, since I loved the 1st one so much and did not have anything with a decent reach at the time.
Oh wow! The X-S1 is still just as awesome, all these years on.
In decent light it creates nice colors with excellent contrast. Just do not pixel peep every picture.
It also has a decent flash for low light situation, for in-fill or normal flash. Since it has a hot-shoe, it opens other doors too.
It has a HUGE EVF. I could not find specs on the EVF, but compared it to my X-H1 and its exactly the same size, so I presume .75x magnification then also. Its much larger than the X100, X-E1 and X-T10 which I have had (or still have).
The handling is also very good ad with plenty buttons and a manual zoom, it is a pleasure to use.
—— WISHLIST ——
My wishlist for a X-S2 would be more or less the same as the OP’s list:
latest Chipset latest EVF (although the old one is not bad) fully articulated screen with touch functionality would be nice, but I do like the current buttons on the left which will then have to go. wifi is not a deal-breaker for me, but I can understand why it would be a welcome addition a zoom action which does not droop when pointed downwards Zoom lens equivalent to 24-600mm f2.8 to f4 would be awesome. The above and a new X100v (with a decent Bayer sensor like the X-T100 has) to compliment it, will complete my photo tool wishlist.

After moving to Fuji X system I extensively used large number of Trans-X bodies and XF lens. Most of them perform excellent optically and very good mechanically. I think Fuji is doing great job designing and supporting gear.
The only thing is bothering me all the time - if the electronics is dead lens typically becomes fully unusable. There are numerous third party or adapted fully manual lens that solve that concern. But what if I want to keep using my favorite Fuji optics mechanically? I've performed numerous attempts and discovered potential of converting XF 35mm F1.4 and XF 27mm F2.8, and recently found highly satisfying result of adapting Fujinon XF 27mm F2.8 that requires relatively low effort.
Here's resulting article explaining what can you do with electronically dead Fujinon XF 27mm F2.8 lens to bring it back to life in much more compact frame of Industar 50-2.
Alternatively you can also use adapted Fuji XF 27mm F2.8 lens on other APS-C cameras like Sony or Canon.

 

 

I love the 23mm focal length, but I'd say it's a toss up depending on what your personal preferences are. 35mm could be an excellent option as well. Either of those two will probably be an ideal prime to complement the zoom. I probably do 90% of my photography with either the 23 or 35 and the remainder is a mix of the 16mm and 55-200mm. The 23mm and 35mm may seem fairly close in focal length, but there is a huge difference between them when you're actually out shooting. I'd get as close to each of those as possible on your zoom and try shooting at only one focal length for a bit. Try at 23 first, then 35. You very well may end up owning both of those primes eventually, but that will help you decide which to buy first. The other question is how comfortable are you getting close to people in your street photography? If you're very comfortable with that, then the 23 makes a lot of sense. If you're not that comfortable with getting close to people, the 35 might help then you can get the 23 as you get more comfortable.

I'm going to be the contrarian here I suppose.  The 18-55 is my "don't leave home without it lens"  period.  I also own a bunch of primes (as you may note in my signature)  including the 23 1.4 which is amazing!
 
As a matter of fact I'm headed out for a four day long, out of state job this weekend and I'm packing the 16 1.4, the 35 1.4, and the 60mm 2.4.  And, just in case, the 18-55 will be in my bag.
 
I truly will try not to pull the 18-55 out of the bag as I'm trying to use my primes more.  We shall see.

Fujifilm X100F
ISO 12,800 (Yes. That's correct!), 1/50 sec, f/4.0, Handheld, Available Light from LHS Window