I haven't really paid any attention to the feature set since I've only used Windows for games for past 5 years and ~6 months ago I gave up on Windows completely, but let's say it give you everything Linux gives you. You can just use rvm.io to install your ruby and then use gems to install everything else you need (author used Jekyll as an example). What is the real gain to be have'd?
I can not see a single reason to switch over to Windows from perfectly working OS just because Windows is catching up. Only argument you can reasonably make is that Apple has neglected Macs and you can build faster/more powerful PC and run Windows on it, but what front-end stuff needs that much power? Imo unless you are working with 3D or something like a game meant to played on Windows there is no benefit switching to a more powerful machine.
Maybe I'm missing something obvious, maybe the author was upgrading from early 00s model of Mac/MacBook, but if you have anything even recent-ish from Apple, I see no benefit in switching.