It only matters if you are purchasing a frame set or building a custom bike for which you want to control some of the performance parameters. Many if not most folks will just purchase what's available.
On the other hand, some wish to know just for the heck of it.
Some actually do build their own bikes.
Some want additional information to assist in fitting their next bike.
For additional comparisons, see:
Sterio enthusiast
Computer enthusiast
Automobile enthusiast
Tool enthusiast
Gun enthusiast
Any one who want new shoes
Almost any woman who is shopping for clot...........anything.
Skiers
Tennis racquet buyers
actually anyone who is an enthusiast about anything.
Or Tom.
