I'm not sure what you mean by Windows systems being "all for consumption". To your defense, I haven't tried Windows 8, but Windows 7 certainly has a huge base of productivity software.
I could see the sentiment as being valid if you compared modern systems to, say, Commodore 64, where programming the thing is actually something you have to opt out of after boot, but I have to say that Amiga really isn't far off from modern systems in any way related to productivity.
I'm not going to say you're wrong here, but I think there has been an increasing push towards computer-as-consumption-device in the last decade and a half - and while I think it's only gotten really bad in recent years, it was already starting to be a trend when Windows XP came out (as fond as I am of XP, look how many steps were taken into "media integration" with it, as compared to 95-2k. Hell, it was the version where they introduced a dedicated "Media Center" version of the OS.) Nowadays it's apparently
expected that an operating system will auto-index all your media files into a master library, auto-play any CD or DVD you drop in the drive, auto-everything so that you barely have to get up off the couch to be a media consumer.
Don't get me wrong, there certainly is a lot of great productivity software available for Windows (which is why it's taken me so long to even consider switching some of my pursuits over to my Amiga,) but the emphasis has shifted, and continues to shift. And while the Amiga is just as great a games machine as it is a productivity machine, I think Hattig's point holds true, because it was out of the mainstream
well before that shift began to take place.
When we got our first computer (a Mac IIcx) back in ~1992-93, it was
expected that anybody owning a computer would be using it for productive work; the only systems that anybody saw as dedicated games machines were the consoles. And we
did use it for productive and creative work; my brothers and I drew stuff in MacPaint, or created doofy stories in Storybook Writer and Opening Night. We got our first electronic piano and my mom took up sequencing and printing sheet music on that Mac. And this was
the norm back then. None of us were "computer people" at the time, and only my next-younger brother and I really ever became "computer people." We were all just ordinary people exploring the potential this new environment had to offer.
That's not really true anymore. "Average users" don't create, they only consume. (We're told as much - repeatedly - by advocates of consumption devices like tablets.) Nowadays, I'm pretty much the only member of the family who does anything more creative than my taxes on my computer; my brothers play games or read Cracked, and my parents read the news or hang out on Facebook. There's been a shift, and I think I'm the only one who's even noticed. And even I have more trouble getting myself in a creative mood on my modern systems.
I don't know what it is. Maybe it's just psychological; maybe putting myself in an old environment causes me to revert to the old mindset. But there's just a certain
je ne sais quois electronic-muse that vintage computers have and modern computers
don't.