For me, I think transparency is ultimately a question of play style, and play style seems determined by system, GM, player base, and even by a particular campaign within a system. For example, it's possible in Dungeons & Dragons (RIP Gary Gygax) to regulate transparency differently depending on the theme of a campaign (THOG SMASH versus The Delicate Art of Poisoning Your Friends). In Dungeons & Dragons, a GM can insist that all rolls be done in the open, selectively, or exclusively secretly and not lose coherence to the rules of the setting. With a skilled GM and consenting players, the degree of transparency can even change dynamically.

I do not think such flexibility is exclusive to any particular game system. With a little extension, it seems that generalized impositions of varying degrees of transparency are dependent on how integral secrecy is to every possible game within a setting. If I were to create an RPG entitled Live Nude Baby-Eating Shenanigans on National TV(tm), in which the PCs' goal is exclusively to hog ratings and top each others' exploits, I might conceive that total transparency is desirable, even integral to every possible game in the setting.

More realistically, I expect that individual tastes and styles will always win out, regardless of what a setting dictates.