I believe at this point it's mostly due to anti-cheat. Proton (Steam fork of wine) works pretty well with a lot of games now, however anything with anti-cheat is still out of the question.AFAIK MapleStory relies too much on software libraries and technologies exclusive to Windows for it to be run on any other platform, even if Wine or Play on Linux was used. OS X isn't a suitable choice for gaming nowadays anyway.
I dual boot into Linux/Windows and have no problems running Maplestory, I don't see why they would have any issue with Mac/Windows.However, if you really want to play using your Macbook, I'm pretty sure you could do so by installing Windows aside your pre-existing macOS via Boot Camp. That way you can switch between Windows and macOS whenever you need by restarting your machine. Then you could install MapleStory on the Windows partition of your machine.