Many packages use rolling versions from git commits, so while the PKGBUILDs don't get updated, any time a user re-runs makepkg on that PKGBUILD the latest commit is pulled and built.
In those cases, a PKGBUILD might be months or years old, but still consistently up to date and valid.
Honestly, I don't see this happening.
Many packages use rolling versions from git commits, so while the PKGBUILDs don't get updated, any time a user re-runs makepkg on that PKGBUILD the latest commit is pulled and built.
In those cases, a PKGBUILD might be months or years old, but still consistently up to date and valid.