Drymounting makes the print look professional, gives you something to handle besides the print itself, and actually protects the back of the print from atmospheric contamination, and to a considerable extent from things like acid migration too. Classic silver prints by famous photographers that sell for hundreds of thousands of dollars apiece are routinely been drymounted. So are entire museum collections in many cases. Customs might differ in different countries, but the notion that, correctly done, drymounting diminishes the value of fiber prints whatsoever is nonsense. As one of the galleries which featured my own work stated, the correct suit and tie upgrades the value if you're trying to compete in good company. Sure, something like a platinum print on rag paper might look more appropriate hinged like a watercolor, but
who that heck wants to view a glossy silver print all wavy or wrinkled. I've always preferred Colormount - not for color prints, but for fiber-based black and white work. Very dependable.