https://github.com/prusa3d/PrusaSlicer/issues/12968 2.7.4 is the last good version of PrusaSlicer; unless Prusa employees decide to reverse their current strategy (appears to be unlikely), 2.7.4 will continue to be the optimal version of PrusaSlicer indefinitely. Please reinstate the 2.7.4 ebuild.
While I'm not saying we *won't* restore it, it's generally not sustainable for us to keep old versions forever (the 3dprinting stack is so hard to keep building at all). See https://wiki.gentoo.org/wiki/Downgrading_a_package_to_removed_version to maintain it locally.