It's actually a good idea within limits. Faster block times reduce the variance in the time it takes to achieve a certain degree of safety. 3 confirmations on

It's actually a good idea within limits. Faster block times reduce the variance in the time it takes to achieve a certain degree of safety. 3 confirmations on BTC takes 30 minutes in expectation, but it's very easy for it to take 60 or 90. In contrast, while it would also take expected 30 minutes to get 120 confirmations on Ethereum, the likelikhood of it going substantially longer is small. Waiting 30 minutes for a transaction is annoying, but you can plan around it. Unexpectedly waiting an hour and a half is maddening. :)