In questo post:
https://bitcointalk.org/index.php?topic=5037728.msg46172458#msg46172458Gregory Maxwell (uno degli sviluppatori di Core) afferma, contrariamente a quanto stiamo discutendo qui, che
1) non c'è affatto grossa urgenza di aggiornare i nodi
2) il fatto che un nuovo aggiornamento richieda del tempo prima che si propaghi per la rete è un bene, non un male
If a user isn't accepting transactions on a node or mining with it, there is no particularly urgent reason to upgrade. There are plenty of upgraded nodes on the network now.
The reason the notices encourage people to upgrade urgently is not because all actually need to, but because figuring out if you really need to or not is hard, so the best advice is for everyone to do it.
[...]
... against the risk of a malicious update being deployed. The fact that upgrades take a while makes me feel confident rather than frightened.
It's like the advice goes, "if you never miss a flight, you're probably wasting too much time in airports". If we never had reason to wish updates went faster, we'd probably be excessively exposing users to the risk of a bad update.
If there ever were a really serious issue where updates had to happen or else, we'd be probably advising people to stop accepting confirmations and to potentially to turn their nodes off.