I find your list of issues to be intriguing. Since the update to OneUI on my Galaxy S9+, I haven't experienced any of the problems that you've described. Admittedly I haven't used a couple of the features that you've mentioned, but I have used most of them without any issue whatsoever. Mine is a stock S9+, as supplied without any modifications. Some of the problems that you describe sound as though they are "theme" related. I have discovered that after any software/UI update, if the has been any sort of theme applied/configured on the device, various "display" and "usability" problems develop until you switch to a new theme before respecting your previous theme (for some reason, simply "reapplying" the theme doesn't always fix the issues). I hope that it's literally just a theme related issue and you can restore usability of your device easily. Bixby is annoying, as is the Bixby button, but even on a stock device with OneUI, you can easily configure it in such a way that the problems that you've described do not happen (assigning different tasks to the button press & double press options, disabling the majority of Bixby functions - I actually forget that there is Bixby on my device for how unobtrusive it is now that I got the settings sorted). Following the update to OneUI, I did need to spend a bit of time going through all the settings and configuration options, bit that's to be expected after updating to a completely new OS UI front end. I strongly believe that 95% of the problems that you listed can actually be cured if you spend a bit of time adjusting your settings after you've completed the process of changing the theme.
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