Pretty much everything has already been said, but the poll speaks for itself. A very small minority want to force people to use autosaves only. Most people want to save anywhere, while a subset want XP and skill gain boosts for not loading.
Autosaving does not prevent people save scumming. It just makes it slightly more complicated by forcing people to manually copy the save files to a backup directory rather than handling it in game.
Saving anywhere seems like the logical choice. It in no way prevents people that donāt want to save from doing so. Whether the bonus for not loading is worth spending time on to please a minority is debatable, but again, it in no way impacts either of the other two groups.
The only poor choice is forcing people to use autosaves. It inconveniences the majority for the benefit of the minority. 13% of people that voted in this poll.