Well. IMHO P.O.S. systems are multitasking machines. I feel that you don’t need to lose the old “diner” feel like memo pads/tickets and such.
I believe that P.O.S. systems excel at delivery orders and store management, inventory, time schedules, order tracking.
Without knowing how your shop is set up it would be hard to know if you could add a P.O.S. system without it altering the appearance that your customers and you have come to love.
It would be hard in my view to track customers. track sales, and in turn make your shop a big competitor in a saturated market without a P.O.S. system.
With this being said. I assume you were making a statement about why you believe you can’t institute a P.O.S. system. Very few customers would notice the change unless you are a dine in/pick up store only.
P.O.S. systems are a BIG ticket item. second only to your ovens most likely. (maybe your mixer if you go the low cost P.O.S. route.) The correct decision in a P.O.S. system will pay for itself quickly for a busy store in all around savings and tracking of every aspect of your business. The man hour savings alone could make it worth while.
Maybe this will shed some light on why they are good items. While I understand fully why you wouldn’t want a P.O.S. system, I see to many benefits to not have one.