I'm not going to quote people but there are some posts here that are simply flaming Windows which I don't think the purpose of the OP was. For one, there are not a lot of PROFESSIONAL options on either Mac or Windows platforms. PLEASE don't do that. That is not even a proven statement. Second, SERIF making a Windows product means more money for them - it's a GOOD THING. It's not making software as some sort of Mac tribe fan boy thing, but to make revenue, and so it would not hurt them to make a Windows version - your feelings have nothing to do with it.
Third, Adobe has left a big gap with its CC subscription based model. Remember supply and demand? Thier products lack security, privacy and a sense of ownership. It's customers are looking for a way out. Affinity is a PROFESSIONAL alternative. Windows users are not going to give up Windows for thst, but will just suffer until someone creates what they need. Apple is what Adobe has become, and Windows users are not going to go there either. It's much more productive go make what they need, which is an Adobe killer for Windows.
Lastly, stop scaring people not familiar with Windows with lies and myths. There us no memory management issue with Windows. And memory is much cheaper for PCs anyway. But that is a non-isxue. Also, The MacOS can be virtualized in Windows too - so why keep suggesting to buy a Mac? Perhaps those posters are Mac users who just don't know any better? If that's the case ASK, and stop making unqualified statemdnts.
The thing is - 90% of the computing world is using Windows. Don't let this opportunity pass you by - because if you don't want the money someone else will come along... and then where will your product be? Love it or not, you NEED to develop for Windows, or stay stuck as a niche, "could have been" product forever.