The inexpensive monorails (e.g. the old Calumets, B&Js, etc.) are often that way because of simplicity of construction. The standards are fixed, and not easily removed from the rail. The more expensive designs (Sinar, etc.) tend to have more options for breaking the camera down for travel. Newer, moderately-priced cameras like the Toyo and Toho allow some break-down, but less conveniently.
When I started with LF in the early '70s, I had an early (fixed standards) Calumet, and just packed everything into the fiberboard case. I then slid that into a large backpack. While heavy, I was young enough to haul it around the mountains of Yosemite. Now, the monorails are used only a few feet from the vehicle. ;-)