I'd argue it's actually breaking three vulnerability cultures. In addition to the two Jeff mentions, I think the culture of delaying upgrades and staying on stable versions for as long as possible is going to become increasingly untenable, if everything that's not latest can be trivially scanned and exploited. In the extreme I think there's a decent chance projects like Debian might have to radically overhaul or just…
Not so daunting for me having come of age when compiling a kernel specific to a hardware platform was essential.
Custom software that does not fit the usual patterns is not fool proof but it won't be obvious.
Monocultures with all their eggs in one basket are even less secure than truly diverse ecosystems though.