Definitely right about maturity. I’m not sure what the second sentence means, though?
If you mean it’s not worth bothering everyone with a popup warning just because some people are immature, then I (very) respectfully disagree. Immature players can (and often will) leave a Steam review just like anyone else.
Plenty of games (especially roguelikes, which Siralim lists as an influence) are designed around permadeath, but Siralim emphatically is not, although that’s not made clear to a new player. Unless they’ve read through the forums before playing, how are they to know that a “run” lasts hundreds of hours?
I make it a point to choose permadeath in games where it is offered, because I enjoy the thrill. The only thing that kept me from choosing it in Siralim was that it was in “Advanced” options, and even so I almost did. I just had no idea how much investment there would be in a single game, and I’m very, very glad I didn’t choose it.
On reflection, I think locking Hardcore mode until the player has reached mage level 50 in a normal game is the perfect solution. No need for annoying warnings, and instead of trying to describe in limited screen space just what they’re risking with permadeath, it shows them directly.