What may feel implicit to you would most certainly be expected by them to be explicit.
You get what you pay for.
You say "Can I have 1,000 of these printed?"
They say, "Yes, they'll be ready Wednesday. That'll be $25 please."
You say, "Can I have 1,000 of these printed & guillotined down to the crop marks?"
They say, "Yes, They'll be ready Thursday. That'll be $50 please."
The press & the bindery are two different departments - each needs paying for a task.
Take it to extremes... you wrote a graphic novel.
The entire job would be...
Making up the plates.
Set up on the press.
An hour & 100 sheets waste to get the machines in register & colour-balanced.
The print run.
Repeat the last 3 for each book section.
Section; fold & stitch, sew, or glue;
Apply the cover [which would have been a job all of its own, plus lamination or UV varnish].
Box or palletise.
If you paid only for the printing, that's what you'd get - a pallet of printed sheets - instead of boxes of books.
If you assume laser printing rather than offset litho, you still have to pay the bindery.