Slomo
It's Complicated
I don't see any value in this.
Slee says they are working on a bolt on crawler with no gas tank mods, which gives you stock low range and compounded low range as you choose - that is a better range of choices than just an Atlas.
On the big climbs, you engage the crawler for super crawl ratio, and then disengage for the time between obstacles in regular 4lo. Can't do that with an Atlas - you have to choose your ratio and live with it while in low range.
What am I missing?
You make a very valid point but don't forget there is a 4 speed Atlas case that offers just the options you mentioned and choices of multiple gear ratios for each range.