They are two different types of approachs and two different type of replay values.
The replay values on metroidvania lies on the extra modes.
The replay value on classicvanias lies on repeating the levels (in different order/different character if possible).
This is true.
What about a lot of the stages of CV64/ LOD?
I'm thinking particularly the forest level/ castle keep/ villa.
You had to do things, but these levels were all open ended.
In all honesty I haven't replayed LOD as much as say SOTN, but it was pretty close.
I really like all the ideas of Simon getting weaker due to the curse...but how would this work with there being another game after it? Nightmare mode especially, but even "regular" modes dying from the curse, you can't really make that whole part of the game where Simon dies from one-three hits. That'd be challenging, for sure, but I think by that point it might be too much.
Well think of it this way, in CV II Simon never got weaker - this would be 'normal' mode. From the CV II component of this game, Simon is cursed and the following rules apply:
Normal - Simon levels up, whip changes every 10 levels, doesn't get weaker as time passes, enemies are stronger at night (but not inside towns/ mansions)
Hard - Simon doesn't level up(at base level 1), whip changes when he's slayed the equivalent amount of enemies = 10 levels, doesn't get weaker as time passes, enemies are stronger at night (inside towns/mansions with seamless transitioning)
Very Hard - Simon doesn't level up(at base level 1), whip never changes (stays at leather whip), Simon doesn't get weaker as time passes, enemies are stronger at night including bosses (inside towns/mansions with seamless transitioning)
Nightmare - Simon doesn't level up(at base level 1), whip never changes (stays at leather whip), Simon gets weaker as time passes, enemies are stronger at night including bosses (inside towns/mansions with seamless transitioning), Dracula has a hidden final form which is devastatingly difficult.
Only veterans would be playing on the hardest setting. This way casual gamers would not have to. I don't see why this can't work, DMC has
Dante must die mode. Again, nobody will play that unless they love the game, and/or are really into the series.