A lot depends on the type of game. Fancy adaptive systems aren't necessary with games that have a properly-designed learning curve, for instance.

Story-rich games such as the Mass Effect and Dragon Age franchises can give the option of a 'Story' mode, where the combat plays second fiddle to the decision-making and problem-solving aspects.

Otherwise, as with Elden Ring, the designers can simply warn potential players that the game is difficult. If you've gone to the trouble to create a high-quality game to really stretch the skills of experienced players, then adding an Easy mode defeats the object.

However, as in Elden Ring, you can instead cater to peoples' preferred playing style. I'll own I've yet to get very far in the game. But rather than give up, I've experimented. As a result, after messing about and getting nowhere with Vagabonds, Heroes, Astrologers and Bandits, I tried the Samurai origin and did a bit better. Then I tried the Prisoner origin and did a lot better! The class suited my style better. Now it's just a case of experimenting as I go with different builds. I'm in no hurry.