When This game came out, XP was big with Vista/7 shortly down the road. Until negotiations proceed the way many would dream of, then I doubt compatibility will push the need for players to "need to upgrade" as there's no incentive for the current devs to do so. Often we see threads like "will this run?", "what should I buy just for the game?", or "do I need to upgrade?" and the answers seem to vary, but when it comes down to it, if it's ONLY for this game, the "potato" term wins.
By all means, if you're playing on your "main", "work", or otherwise should be up to date system, then yes, keep that thing patched so you stay safe and secure online, and upgrade as far as your system can handle. Something people don't realize is that with each Feature update (as with MacOS), the OS requirements slide higher/more modern and eventually to the point that devices that could handle the release version of Win10 can no longer handle the current version of Win10.