Hahaha!

...right, totally fundamental, just like a hover chair and glowing pen. But, yes, I'll make some GUI elements detachable, but it's still in a browser. This means you can't have several windows as far as I know. Also, if you go fullscreen with a browser, I don't know, if they nowadays go over two monitors, but back in the day this would only go full on one. However, I'm sure you can maximize a window over two or more screens.
Anyway, fundamental for a digital painter or any artist is that he can paint and have imagination. If you do somehow remember, I've been a professional digital artist for 3 decades and I've never had to use more than 1 monitor. Today I have (thanks to a dear friend) a 4k monitor, knowing that you can get up to 8k monitors these days, soon making multi monitor systems no longer relevant for anyone outside the NSA, or so, hahaha, so.... the most relevant thing a tool has to supply is the means to enjoy being creative!
