Housing is something people need, and is similarly a necessity like food or electricity. It needs a lot of money to keep in a livable shape, plus constant attention, and will lose its value if just left in place. As such it's not an investment, unless the market isn't working like it's supposed to.
When there was the long period of "low inflation" after the 2008 housing crisis, it's because we didn't consider housing prices a part of the inflation – if housing getting more expensive would've been taken into account we should've never had such a long period of low interest rates. If rents going up is inflation, appreciation should be as well.
As such, housing getting more expensive should be considered a bad thing, as it leads people to mistakenly see it as an investment. People will then "protect" their investment by trying to prevent new projects etc. Nobody would get angry if bread was cheaper the next day, just because they already bought it yesterday.
EDIT: apparently I've been a bit misinformed. I'm not from the US, but EU (Finland) and have understood that our indices don't really include owner-occupied housing in the calculation, but only the direct costs like energy and rent with some weight – which was at least partly the case, but there would seem to be some changes coming. Thanks for the enlightening replies, I'll have to read a bit more into it.
As others have noted, it is included in inflation measures here.
But on your point about price appreciation being a negative factor not positive, I'm with you. I am not helped by my house being "worth more", it just raises my cost in taxes and insurance and makes my city shittier when the people who work here can't live here because they are priced out.
I talk with the husband about this - we bought our house at what I thought was the peak of some bubble, thought we overpaid. But not even 5 years later it would sell for twice that, so he thinks we got a good deal. I'm valuing the utility of housing as shelter, it can't be "worth" more than 30% of two average monthly net-pay for someone working here, right? By that measure we overpaid, can only barely afford it with two good incomes (us) plus two part time incomes (our teenage kids) He's valuing it like an investment and by that measure we got a good deal, we bought something for x and now it's worth 2x.
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