It is set up to ask for either pin/password/pattern every 3 days IIRC.
Yeah, that's how it is, and it's NOT a new feature in Android. If you setup your phone or tablet for biometric unlock, like using fingerprint, retina scan, face ID, voiceprint, MRI or CT scan, saliva sample, or breathe test, etc, it will periodically ask you to verify your pattern, password, or PIN. And on all devices I've had it's every 2-3 days, and isn't a problem for me.
You can turn it off it you want, and leave your device unlocked, but any payment and financial apps will still insist on you entering a PIN or password for transactions.
The requirement to periodically enter your password, PIN, or pattern unlock is not a new "Security Feature", and has been around for at least 6 years that I know of.