ICAO introduced airspace classifications for good, proven safety reasons, i.e. pilots would know what type of service they would get in a particular airspace – all just good commonsense.
Errr, what alphabet soupspace am I in today??
The ONLY reason alphabet soupspace was invented was to facilitate the "Free in GE" mob. Martha told me so! Alphabet soupspace does not improve safety one iota, nor in most part, does it save any flippin' money. Get off it Dick.