Will there be a setting for the power of magic? So that in some worlds, wizards would be godlike, in others they would be on par with mundane sentients, and so on.
We know that there will be at least one sort of slider for generating mundane vs. strongly magical worlds / settings. What we don't yet know is how many sliders, and how they would be split up.
In my opinion, to meet the stated design goals there will probably need to be *at least* two sliders; one for "how significant / powerful magic can be" and one for "how common magic is". E.g. the Tolkien legendarium has very powerful magic, but compared to many fantasy settings (especially fantasy games) magic is quite rare. Conversely, an action RPG type setting might have extremely common magic, but it's not capable of changing the world on fundamental levels more than, say, a good firearm could.
A third useful axis IMO would probably be "cost and cost efficiency". In some worlds, the main limitation on magic is that it carries prohibitive costs of various sorts. (This might be mana / energy, selling one's soul, cost of rare / exotic / dangerous / forbidden consumable materials, personal behavior limitations / vows / geasa, or many other things.) In other worlds, mana recharges with a quick rest, components if required are mundane shopping items, etc. Looked at in another way, if your goal is to explode an area ("fireball"), is it more or less efficient to do so with magic than with chemistry / engineering?
Side thought... A setting where magic is moderately common, but at least partially obeys conservation of energy such that a mage has to eat an appropriate amount of extra calories might be amusing, and an excuse for why DF farming is so easy. "Urist McAncientAstronaut is lifting the massive ashlar blocks of the great pyramid project into place with his mind, and is on a 20,000 calorie a day diet..."
Hmm... reality check. Hafþór Júlíus Björnsson (who despite being huge, is quite dwarfy in many ways) has a
training diet of ~6 kg of food a day, with macros of ~850 g protein, ~460 g fats, ~790 g carbs. That's about 3,400 + 4,140 + 3,160 = 10,700 calories. Given a lower tech setting without protein powder and where carbs (bread, beer) are the cheap calorie option, Gaston's "five dozen eggs" a day is actually a reasonable part of a balanced training diet (60 eggs is ~380 g protein, ~320 g fats, ~30 g carbs; ~4,650 calories) for someone "roughly the size of a barge"