I'm not complaining. I'm simply saying that you shouldn't assume that everyone's space needs are the same. Could I survive without the drum kit? Sure. The piano? Probably not for very long. For me, music is a crucial emotional outlet that I do, in fact, very much need. I'd probably sell one of my legs before I'd sell my piano. I've owned it for two decades, and it is very much a part of me.
But the more important question is whether that space could somehow be converted to another use that would fulfill one of my other desires. The answer, of course, is no. There's no practical way to turn my living room into a wood shop, because that pretty much requires a dust-proof floor, which carpeting is not. And it is highly incompatible with any other use of the room because of the dust involved.
I try to do the dustiest work outside, but with me being at work all day, I have very limited daylight hours in which to do so. As a result, the lack of a dedicated wood shop triples or quadruples the number of days that any given project requires, because I basically get to a point where I can't go any further without making some major wood cut, and then I'm stuck waiting until the next day that I get home before dark, which may be two or three days away.
What makes me uncomfortable is when those projects cause me to either lose the use of my main bathroom or kitchen for weeks at a time. Yes, it is, strictly speaking, a want, in that I want to be able to do woodworking projects, and that my survival is not dependent upon my ability to do them. However, because I am unable to do these things usably in the space available, I do need more space if I hope to do these things in any non-insane manner. And that was my point—that one should not assume that other people don't have valid reasons for wanting more space merely because you don't. :-)