Interesting, I didn't know those functions were built into early Solidity contracts. I am a bit surprised and disappointed, but as you point out I guess you need a nuclear option for hacks other then forking.
Thanks for including the story about the hack and hard fork of Steem, I didn't know about that hack. I still have a fond place in my heart for Steem, so I appreciate learning more about it. Plus the story humanizes Dan larimer a bit, to know that his project got hacked and his Steem was taken.
I wrote a post about this PayPal stablecoin myself, but I focused on the speed and cost of Ethereum transactions as being the oppositie of what you would want for a stablecoin project which would compete with faster , cheaper blockchain stablecoins, especially Hive Backed Dollar. Now you have given me more very solid reasons that this is a centralized security risk to users, in addition to a slow and expensive vehicle.
Cryptocurrency is seeming an endless rabbit hole, and I am constantly learning more about it.