True, but given that we all seem to have our personal preferences, why should we even have to ask for such basic information?
For older players (such as myself) who have arthritis, these measurements often determine whether or not I will have any further interest.
Instrument weight is another one. I'm pretty fit, but lots of older players have back trouble and don't want to purchase some boat anchor.
You're right: they're not being deceptive, just lazy, and probably it's costing them potential sales. It's in their own best interest to make things as easy as possible for the buyer. If I'm already "on the fence" and the information provided is scant, rather than drafting a message enumerating all the things I want to know, I'll just move on.
I actually used to do as you suggest, but as often as not, my questions were ignored anyway, so now I rarely bother.