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I was thinking of openSUSE and Ubuntu, but you're right that openSUSE still has 32-bit libraries around. In the openSUSE Leap 15.0 standard repos, there's 6554 packages named "lib..." and 1368 named "lib...32bit", so roughly 20% of libraries have a 32 bit version still, which obviously could well be enough to contain all the libraries needed for Steam.
(In total, there's 36237 packages, of which 1804 are 32 bit.) With Ubuntu, I'm not entirely sure, as I don't run it, I've just heard that Lubuntu is having problems, because they would still like to support 32-bit, but with other Ubuntu flavors not anymore being released with 32-bit support, they're having trouble keeping it up.
Might just be proper testing of the 32-bit libraries, though. Well, and then there is obviously more niche distributions, which never bothered with 32-bit. Chakra Linux, for example, is so niche, they don't even provide any GTK applications in their main repository, and I think no 32-bit packages either. They do have a community repository, which has more stuff in it, but even there, I can only find around 20 packages with 32-bit support. |