I think for the most part it is. Many on here that are older, lived with certain sizes for many years, and regard them as the norm. I grew up somewhere between 4 piece kits and 20 piece kits, and have different ideas of what looks right. I would never have a 14" deep bass drum on a modern kit, because to me it just looks too small.It's fashion. Like wide-leg jeans or Member's Only jackets.