It's often a lot easier simply booting off a clone that does support discontinued apps than going through the effort of selecting and learning new apps.
With today's cost of ssd's and cheap usb3 enclosures, it's a pretty cost effective approach depending on what one thinks their time is worth. With respect to abandoning Aperture, it took me 2 years of messing with an array of then available editing, DAM and combined apps (now 3 or 4 more available). Time well spent, no. Did I gain anything, nothing of substance. Would I do it again, NO?
Some will suggest recent discontinued versions of OSX won't run on new hardware. Certainly not my experience. Or a new OS is required for new cameras. Not everyone trades-in perfectly good bodies every year or two. Or, tiffs with today's cpu's and storage costs are no longer "difficult".
Each of us decides what's best for them.