Proof of Stake is unable to deal with network partitions, the likes of which every so often happen to cut entire countries off the Internet
PoS is a disaster waiting to happen for Ethereum.
PoS is a disaster waiting to happen for Ethereum.
It's true that Ethereum 2.0 will require 2/3 availability in order to finalize transactions, but that's true of any BFT system; see [1] for a proof.
[1] https://zoo.cs.yale.edu/classes/cs426/2017/bib/bracha85async...
Ethereum is designing the system specifically to accommodate that sort of problem, last I remember you needed 95%+ uptime to generate return, so if your internet goes out 5% of the time you should not stake.
Because it would be obvious?
The world does not exist in a state where a "true" network partition can ever happen.
A "true" network partition I would define as preventing all information, of any type, from going into and out of a country.
This is a ridiculous scenario that isn't even worth considering.