...To try... or else you won't be able to sleep?
I am also brand agnostic and since we now have plenty choose from, we are in search of that one camera that we are going to enjoy working with perpetually.
I am a fan of weather-sealing on anything. Cameras, outdoor equipment, sensors, etc. My work in my previous life involved working all seasons and in rough terrain so IP44 was just the bare minimum. I even worked with equipment rated at IP79K!
Weather-sealing is a tricky topic because even when a manufacturer rates their cameras IP55 or IP65, oftentimes they don't publish them because of liability. High-end Canon and Nikon DSLRs are easily IP44 but they don't claim it due to liability. Weather-sealing is only as good as the weakest point and, oftentimes, the weakest point is exposed by the user. You took very good care of your X100 in the Sahara with carbonate dust, while many others bring their IP44 cameras there and most probably failing to close one flap completely and get the dust to flood the whole body/lens.
Good practice is still best when dealing with weather sealing with any equipment. Many technicians observe corrosion inside weather-sealed bodies, even with pro gear. Users just don't let the system breathe. Many would shoot in a thunderstorm/torrential rain using a weather-sealed kit, dry the outside, keep the lens attached until the next season, only to discover the the main board or some other component has already failed due to corrosion/water ingress.
I think weather-sealing is completely misunderstood. IP44, which is the bare minimum for my ex-work, simply means that Ingress Protection (IP) is assured for solid objects (4) above 1mm and "water" splash at any angle (4) and to get that limit, water ingress, even by a small margin is allowed. A good example is the older MFT Olympus cameras where their testing involves water jets at all angles but the pressure coming from the jets is undisclosed. They are marketed as weather-sealed but only rated them IPX4, which is of course, very conservative. X means they didn't rate them for solid objects, but it doesn't mean they aren't tested. The latest O-M5 is rated at IP53 so, they accept liability up to ingress protection by (5) dust that could interfere with normal operation but not fully dust-sealed and (3), lower than the E-M5 III, which is just water protection from any angle at 60 degrees.
I did a crash course in optical engineering and I can say that it's very, very, very, very difficult to design an MFT lens that is unsharp even at the edges. When the edges are unsharp on an MFT lens, there is usually a compromise somewhere in the design, like prioritising ridiculous centre sharpness, giving extra background blur, etc.
CIPA stabilisation is just stamped by the manufacturers, like IP ratings. Independent testing in the EU and even in Japan place majority of the 35mm and APS-C cameras at around 4.5 to 5 stops only, not the 6, 7 or 8 stops that many manufacturers are claiming. Olympus even under-rated their IBIS as laboratories even place the E-M1 II at 8 stops stills IBIS body only! I can't find the links but they are in Japanese or from a certain country whose servers are unacceptable at the moment due to a certain geopolitical incident. One can do it at home, by the way. CIPA IBIS ratings are published online.