In my view, no and no. As to the former, my theory is that the aversion (of some) to wearing shell with suits is somehow tied to the association of shell with types of footwear some don't care to wear with suits, eg, boots, bluchers, lots of brogueing, double soles, etc. the link gets established in some folks' minds and, all of a sudden, there's a "rule" in their mind of "no shell with suits." But, such a policy would bar me of wearing my black shell punch cap oxfords (single sole), one of my suit stables. The only variable there is the type of leather. I find nothing about shell that inherently might disqualify it from suit use except possibly ..... (This leads to your latter question) ... does the way shell ages, ie the "roll" phenomenon, disqualify it from suit wear. I vote no. In my view, there is a large world out there beyond the bubble of Style Forum and in that world, gentlemen actually wear their shoes. Shoes that are actually worn develop charactoristics that are attractive to me, assuming they are well cared for. I find creases no more attractive or unattractive than shell rolls. They are both simply evidence of actual usage. Neither detracts from the appearance of an otherwise well cared for pair of shoes.