I care because Windows is a bloated and insecure piece of junk that only gets supported and (sometimes) patched so long as the mighty Microsoft deems it worth their while, before they get sick of slowing profits and want to force the next "user friendly" abhorrence (think Windows 8\Metro) down your throat. At which point half of your current and perfectly working hardware and software also magically becomes unusable on the new platform.
You're clearly what some people like to call a "freetard" and from past experience I can say with confidence that there is a very high likelihood that you let your hivemind opinion dictate your decisions. I used to be a freetard, so I can spot those folks pretty quickly, though you yourself have made no attempt to hide it whatsoever.
Where did I say it had to be free? I do like free software (who doesn't?), but I don't exclusively use only free software "because it's free".
I would consider myself someone who likes to use what works best for me. I am happy to buy software if it is good. I do not think Windows is good
anymore. I loved XP and paid for that but the direction Microsoft is going with Windows 8 and Metro I am not happy with. I have bought many programs for Windows in the past. But as a hobbyist who does not design extremely complex boards I am not going to pay $7000 for an EDA suite. If I had that money to spare I would use it on equipment!
I originally started with Eagle but I just do not like it. Had I loved it I may well have paid for it. I do not know because I started looking at alternatives pretty quickly. Thought I would start with the free software since that's the easiest place to start. Tried gEDA, didn't like that either. Tried KiCad and I happen to love it.
Yes, it has limitations (due to lack of some features) Yes, it doesn't do everything that Altium Designer does. But it DOES do what I
need and it does it without costing a cent. I would be lying to say that the $0 price wasn't a factor, but I consider it a bonus, not a life-and-death reason to use it.
Altium Designer clearly has very good features. Would they be great to have? Definitely. Can I afford them? At the current prices as a hobbyist, probably not. That is why a cheap or free entry level version interests me. But I am not sure I want something that will help keep me locked into the Windows cycle.
Though I don't know why people here are discussing tools that cost thousands and which are clearly out of range of the hobbyist. This idea of an "entry-level" tool from Altium - is it not supposed to target hobbyists and smaller players?
Here's the thing; if you're a goal-oriented person (as in: I need to get something done) then the OS used will not factor into the decision at all. Not even a little bit.
Indeed, if you are a goal-oriented person you will choose what works reliably and well for you. You would not choose what doesn't. I definitely want something that works. My problem with Windows is not price. Windows is an ongoing hassle because of the constant and increasing security issues and with Windows 8 the rest of the 'experience' is going down the toilet.
I want to be able to use my operating system to do what I want. Not have to fight the interface and bugger around with antivirus software. I don't have those problems with Linux and I'm quickly getting sick of Windows.
Cadsoft targets hobbyists (and commercial customers) and they make Eagle available on Linux, OSX and Windows. They don't seem to have any problems doing that either. Even KiCad is cross-platform, and it's free. If they can both do it and be successful, I'm sure Altium can, if their software is really as good as it seems, and they charge as much as the do.
In the meantime, I am interested to see what features come to KiCad with CERN now supporting development. They are talking about donations and fund-raising to make KiCad on par with (or better than) commercial-grade software. As someone who loves KiCad and would love to see new features, I will be donating to the effort.