I'd say it's less secure. But we could just add tje required number of confirms.
I'd like to read an expert's answer.
Yes.
This is considering a double spend attack.
For anyone who did not understand , 6 confirms in Bitcoin with 10 minute block time = Needs an opposing power to have good luck and a large amount of Hash Rate for an hour.
600 confirms with a 6 second block time is the same thing as the party needs to keep up the hash rate for an hour to double spend.
6 confirms with the 6 second block time would be insecure , but that could easily be kept in proportion.