There are limited circumstances when hording them might make sense; rumors are that there's been hording of XP vulnerabilities in anticipation of the support pe

There are limited circumstances when hording them might make sense; rumors are that there's been hording of XP vulnerabilities in anticipation of the support period ending, as using them pre-support might have meant that MS would have patched them, whereas saving them would presumably keep them unpatched forever. But yes, generally you're right, and this circumstance is obviously different from that one.