Because I wanted a 26" wheel road bike that handled better than my 1992 XO-1.
Backstory: For some reason I decided about 1990 that 26" wheels were better for road riding than 700C and, after road-ifying several mountain bikes (wonderful 1991 Stumpjumper Team was the summit and apex) I discovered that, while they were certainly fast with 200 gram Specialized 26X1" Turbos, they handled poorly with such skinny tires. Thus, when 2-Wheel Drive here in ABQ was remaindering that 1992 XO-1 circa 1993, I bought it and built it up as a gofast lightweight road bike (Sun M14A rims -- purple anodized! Chi chi Grafton (later Topline superlight) triple! 12-19 7 sp cassette! End-of-drop-bar Grip Shift!!) and that was fast too, and handled better than the SJT, but it didn't quite handle well enough. So after I received the alert that Grant was forming Rivendell, I asked Grant if he could make me a 26" wheel road bike that was better than the XO-1. He said, "Oh, it'll be better." And it was. So I put in an order for a 26-wheel road custom in late 1994, which I received in early 1995. This frame used the then-current All Rounder as model, but with steepened angles and road tubing (tout 753!!! -- tho perhaps 531 fork?). Wonderful bike, but too compact -- 54 c-c (my XO was 55 c-c), requiring a custom upjutter stem, and rather too quick with the 22 mm actual tires. So I ordered a custom gofast fixie in 1998, built by Joe Starck, delivered March 1999, still my favorite bike of all time. Then I wanted a derailleur version of the same, so ordered one that I received in April 2003, built by Curt Goodrich.
Long period .... I finally woke up to the fact that the 2003 just felt too dead (subtily so, not grossly so, but over the years I came to realize that it made me work harder than I wanted to, so in 2020 Chauncey Matthews made me a clone of .8 .4. .8 531 built around the Am hub; revelation and stars and fireworks.
In the interim I owned a first-gen shop floor Sam Hill and a second or third hand second gen (blue, 32s and fenders) Ram, both since sold.
Upshot: the key, essence, point, magic of Rivs in ME is: they are unerringly stable in a straight line, and then they turn into corners without hesitation or over-eagerness. Even the Sam and Ram did this, tho' I found the Sam sluggish (and it didn't take fat enough tires for my use), and the Ram somewhat too staid (perhaps being used to 26" wheels affected my judgment).
Now, 3 decades later, I'd like to get that signature Riv handling on a bike that will take 70 mm tires ...
Corollary: When I see effusions of sentiment about XOs, I sigh: Rivs are just so much better, on road and off.