Existed network nodes do not ask old blocks. So, your node will be fine.
Transaction validation does not require data from old blocks either.
So, if your UTXO database is fine - your node is also fine and robust.
The only thing you can not do is cloning.
Thanks for your confirmation.
Perhaps I am just being too paranoid about maintaining the integrity of my full nodes. That is perhaps because I recently keep updating my criteria to ban misbehaving peers, on top of the ones automatically banned by bitcoind.
I think I will post another topic about this as I am not sure about something.