I'm not sure if it's just my car (newish Honda Accord), but the guy who designed the spare really did not Think It Through.
When I went to check the pressure in the spare for an upcoming trip, I went through the usual annoying deal of (1) taking everything out of the trunk, (2) removing the WeatherTech liner that the dealer had thrown in "for free", and (3) pulling up the chunk of carpet that covers the spare well...and there's no valve stem in sight. Yup, it's on the bottom of the spare when it's in the trunk. So I now have to (4) unscrew about 3" of 20+ turn-per-inch hold-down bolt (by hand) to get it out. Yup, it's way low, so I roll it over to the compressor only to discover that the valve stem is too close to the rim for my locking filler chuck to get a grip. So I have to hold my old filler (which never seals worth a damn) on the stem the whole time. And then go through the whole kabuki dance in reverse to get everything put back together. (The idea of possibly needing to do this by the side of the road with a trunk full of luggage doesn't exactly fill my heart with joy either.)
Murphy's Law pretty much guarantees that I'll never need the spare unless I had blown off checking it, so maybe I'm ahead of the game, karma-wise, at this point. Or not.