Yeah, as much as it might sound like just an unneccessary hassle to have to save manually, there really is a difference in how it feels to play.
I think it's essential to leave this optional.
The problem having the game automatically save whenever danger lurks is that it's so easy to get into a pattern of not caring if you die and just going ahead at full speed, which completely changes the atmosphere as you now feel perfectly safe at all times.
A bit how I feel about health automatically recharging in modern FPS games as opposed to good old health kits, but now I'm going too far off topic
Anyway, strange as it might sound, even though you can save manually whenever you want, it really does *feel* very different somehow, and this also allows you to choose how often you wish to save... you might want to let some time pass in between saves, I often do that in games... I used to save every 5 seconds but now I find it more fun to space them out a bit more (though I still do 'save early, save often', just not *as* often

).
Anyway, rambling on as usual, but having a traditional save system should definitely be an option, and I can't see why it shouldn't be - I find it hard to imagine implementing an option like that could take very much effort on Telltales end.
Something I'm even more worried about though is - Telltale not including many deaths at all. Have they given any official statement on this? I can easily imagine a scenario where they decided to cut that specific part of what is very much what makes up Kings Quest, in a misguided attempt to make them more playable.