There are many altcoins who are faster.
Not really true.
Confirmations are a measurement of security. Simple speaking, when you have 1 confirmation in Bitcoin it means the mining power of 10 minutes says your transaction is confirmed*. If you have a coin with 1 minute Blocktime 1 confirmations means the mining power of 1 minute says your transaction is confirmed
That means if you wait for 6 confirmations in a Bitcoin transaction, you should actually wait for 60 confirmations in the other coin and that only if the same amount of Hash Power would back it.
The only (very small advantage) is the 1. confirmation where it would already have the security of 1/10 of a Bitcoin confirmation.