Some resorts ( sandals in particular want a stamp log ) some will just look at your computer.
Sandals will ask you to do a check out dive if you don’t have a dive in six months.
IMHO best to get as many stamps as you can so that you can prove some level of experience.
Lots of people here have been divemasters or have been diving for many years so they have a different opinion.
Most operations will give you the hairy eyeball on your first dive regardless, until they figure out your not an idiot.
some just take the money.