This is false, you just have to wait for more confirmations. And if miners are censoring transactions there will be a fork where you can use your coins.
> One caveat with Bitcoin is that the network is so slow (effectively just 3 transactions per second) that a crash would be spread out over time.
This is false, the majority of people selling already have their coins on coinbase or other exchanges and would not add to the transaction volume hitting the blockchain.