I don't disagree with you on this.
But the point also missed.
The whole thing is dumb on how we describe it.
Because it's eye of the beholder far to much on description.
I think there is a need for consistency in describing it, but I don't think it's dumb. I see it kind of like disc speed For the most part, both flight numbers, and disc speed has been set as arbitrary numbers by the manufacturers.
In general, most manufacturers have agreed to make the flight numbers for speed based on rim width, and, in general, set putters, mids, fairways, and distance drivers at certain speed ranges (1-3, 4-5, 6-8, 9+ respectively). It's when the manufacturers go off of these numbers, or some stupid pro calls a 9 speed a fairway instead of a distance driver, that throws everyone off. New people to the sport might hear that pro call a 9 speed a fairway, and suddenly a new trend emerges, when said pro's own company still calls all 9 speeds distance drivers.
At the same token for the most part, we all pretty much know what a disc is going to fly like when we see numbers 9/5/0/1 on a disc. Most manufacturers probably call that a neutral distance driver. Then there's that one really stupid manufacturer that calls it a neutral fairway driver, but pretty much none of them are going to call it understable or overstable.
The problem is, much like with the confusion with 9 speeds, when a disc is in that neutral range, some manufacturers might consider that "stable", while some consider it "neutral". All the other sides are pretty well agreed on. We just need the manufacturers to clearly set the tone, like they for the most part did with speed. (except for the 1-2 manufacturers who have bucked the trend for speed and should be boycotted until they shape up).