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Most likely because the X-S10 is too new to be listed. Most 3rd party lens manufacturers go over extensive testing before they claim compatibility. Give them some time. Either way, bear in mind that 3rd party lenses sometimes have unexpected issues. E.g. the Viltrox 23/1.4 mentioned by @jacobus had some issues with X-Pro3 bodies. It was scuffing the lens release button. Viltrox now issues a warning for that, but did not (yet) fix the problem.

With Fuji raw files the raw converter matters but no so much for sharpness and contrast. Mostly for artefacts and noise reduction. Lightroom or Capture One shouldn’t be really different when it comes to sharpness. In all honesty you’re comparing a pro-grade full-frame camera like the 5DMkIII (had one for many years) with a consumer grade aps-c camera which most Fuji cameras are. On top of that you mention L-glass which is Canon’s most discerning line of lenses. Without exactly knowing which hardware you’re comparing, my guess is that your expectations are a bit too high. I use Fuji for personal work and have used it for a few years professionally as well (X-H1 a/o with red badge zooms and fast primes). I’m very happy with the results but they’re not in the same league as my current full frame Nikon Z’s. Let alone the Hasselblad H6D...

I've shot loads of wedding on my XT30 and never come close to the 10 minute limit. Decide on the video shots you NEED, nail them. Get the sound on a separate audio recorder, you probably need a gimbal.

Night Time !

Yep. I use focus peaking on reverse adapters and two Minolta-era long lenses with mine, works great!

I do not have a X-S10, so I cannot say one way or the other. But, ..., focus peaking works with my manual focusing Rokinon lenses on my X-T30.

Photo serie "Silent stories" Istanbul, Turkey 2019 Fuji X-T2 + XF23mm f2 R WR Don't forget to visit my site www.josecarpin.com Come check out my instagram jose_carpin_photographer