Pan faces have a logical purpose. They allow for a skinnier, lighter-weight sign cabinet. Presumably, the cabinet is then cheaper to fabricate and easier to install. The returns molded into the pan allow for the light distribution that is necessary to avoid the hot spots and shadows that clearly reveal the locations of lamps, poles, braces, etc., the mark of an amateur. There is nothing uglier or more distracting, or more unprofessional-looking in a lighted sign.
Another advantage of a pan is the rigidity added to the face, added protection against bowing, and, ultimately, a blowout (this is also the advantage of embossed lettering). For this reason, a molded pan can often be made out of thinner plastic than a flat face, again making it cheaper and lighter. Further, cabinets made for pans are often designed to accept a face no thicker than 1/8-inch, making it difficult to force a thicker material into the groove, and worse, turning it into a nightmare to service.
If the cabinet was designed for pans it should be re-faced with pans.
But it's cheaper to use flat plastic, isn't it?. Of course, it is. Similarly, back in the day, it was cheaper to use construction grade plywood for signs, rather than MDO. It was cheaper to use hardware store paint rather than lettering enamel. But I never considered these arguments to be valid. If someone asked me, "Isn't there a way to make it cheaper?" I never suggested not using the appropriate substrate.
By the same token, I would never suggest flat plastic for a cabinet made for pans.
Many people say, "That's not in my budget." They don't really have a "sign budget," of course. I've rarely met a client that does. What they really mean is that they foolishly did not budget
anything for signage because they didn't think of it. And now they want you to be unprofessional and deviate from accepted industry practice just to save them a few dollars.
What if the client didn't budget for utilities? Will the light company cut them a deal? What if they didn't budget for a phone?
I am not swayed by the "budget argument" as a reason to offer slipshod work. But many are, as there are a ton of crappy-looking lighted signs out there. More than I have ever seen in my life. But I am not responsible for any of them.
I was just told by someone that proofed this comment for me that my tone is "pompous *ss."
But, I am too tired to re-write. Sorry.
Brad in Kansas City