Re: "Hubris brings the mighty down."
I find this an odd comment for several reasons.
Linux has several desktop GUIs available. I use KDE everyday, and it also works for the remote work I have to do in the corporate world where I am interacting with Windows data or virtual desktops. Personally I prefer it to Windows. Some of that is familiarity, some concern about corporate data sucking etc. I quite understand if you prefer another system and have the money to pay for it.
I don't believe in the theory of spontaneous software evolution, so sufficient numbers of highly skilled people must be writing the stuff. Some of them even seem to be paid by largish companies.
Hard to see why adding open source applications to the mix of paid software reduces choice. Inkscape and Illustrator may be the most obvious vector packages in those categories, but there are other instances in both.
As for Inkscape, I'm an amateur artist mainly with wet stuff slopped on dry stuff. Inkscape is fun (and less messy) and I look forward to trying the new version.