I'm running ALL of my systems successfully with a tmpfs as /tmp. Applications that need loads of space usually can be configured to use a different directory (on my system /cdtemp, which is a separate LV so it won't disturb anything else). Systems with a "real", but small /tmp (like all my systems before I switched to tmpfs) will run into exactly the same issues you mentioned, so that's not an argument against tmpfs. The installer doesn't need to default to using tmpfs for /tmp, it just has to support it, so users who like it (and know how to configure or even fix their applications) can choose it at installation time, instead of having to boot single-user mode to change this (or reboot after changing fstab, which isn't much better).
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