Without a proper market survey even CoG’s opinion is at best an educated guess, however, I don’t think most people consider the lack of a save/checkpoint system to be part of the core ChoiceScript experience.
If you ask around, and there have been threads in this very forum about it, most people will mention the focus on relationship, customization and engaging narrative, and perhaps even stat balancing.
Another reason I don’t really believe this is the main reason is because you can confirm an option by sliding your finger on it. Whenever I’ve seen this feature mentioned was to disparage it, and it was never requested for before being implemented. You can scavenge the forum after it if you’d like. This feature causes more harm than good, often the cause of an accidental choice. It runs diametrically opposed to the design principle of making each choice purposeful, and yet the feature is still there with no option to turn off.
Edit: it’s now possible to turn off the sliding feature.
I don’t mean to blame Dan at all. I don’t think I’d be any different in his place. But CoG is a company, not a one man band. Hiring freelance professionals is a good solution for small business. At this point it’s just unwillingness, and like I said, I’m not convinced it steams from a design principle.