That's assuming their artistic sensibilities trump your own. One has to draw the line somewhere in presentation. The only time I've ever heard anything like that is as a pure expression of commerce. While I don't officially frame prints for buyers, nor officially care, the mounted and windowed print determines frame size, not the buyer. Of course, if the "artist" just isn't into that (e.g. the work's creator absolves themselves of any aesthetic decisions regarding presentation), he/she can always offer bare prints, cut, cropped, widowed (or not) to any size judged by the buyer – a true collaborative effort () of both purchaser and creator. Heck, why not just invite buyers into your lab to help you determine cropping under the enlarger, contrast, areas of dodging and burning, or other manipulations? Many people, because of ignorance or heedlessness, throw bare prints into a frame squished directly against the glazing (including me on occasion ...OK, it was a small inkjet print in a dime store portrait frame of my dog at the river). All those "archival" print treatments so vehemently touted and argued in classical photography forums are then just so much hot air. All that seems to speak more of a concession to commercialism than it does of professionalism. OTOH, one might possibly care enough about their work to decide on its eventual size and content without the participation and judgement of others.
Originally Posted by George Collier