This is quite a complex question and one that is bound to generate a lot of strong feelings, so first of all may I please make an appeal to keep the playground stuff about which platform is clearly superior to the other out of this thread.
As it happens, the majority of Dorico users are running macOS, but it’s not an overwhelming majority (the last time we checked it in detail, it was around 60% on macOS and 40% on Windows). I don’t know how this breaks down by geography, but it wouldn’t surprise me at all if the proportion using macOS was higher than this in countries like the US, and lower in countries like Germany.
Many of us in the Dorico team do happen to prefer Macs, but by no means all of us: there are strong preferences for operating systems, hardware, etc. within the team just like out there in the wider world of computer users.
We do not especially prioritise macOS over Windows, and we consider them of absolutely equal importance. Now that we support iPadOS as well, that does mean that we are supporting two Apple-made operating systems, but that doesn’t mean that we will be less interested in supporting Windows as a consequence. In fact it is my hope that the new multi-touch components we’ve built for Dorico for iPad will also work really nicely with touch-enabled Windows computers like the Surface and so-called “convertible” laptops.