There are still plenty of mechanically difficult games, such as:
- Titan Souls - you and bosses have 1HP
- Cuphead
- Celeste
There are plenty more, but each of those is mechanically difficult and there's no way to grind to make up for lack of skill. Dark Souls is an honorable mention here because you can make up for some lack of skill by finding better gear, but it's still more on the end of "mechanically difficult" than "numbers difficult."