In games, accessibility features are often considered either:
a) a way to make the gameplay more tame, or altering mechanics to match the player's comfort zone
b) providing configurations or visual changes that help working around certain disabilities.
But one thing that I feel like a lot of people overlook with these features is giving the player a smoother introduction to a game genre. Good accessibility features can actually make some people enjoy a game type they'd normally just not even bother trying, and I think that's one of the reasons why Assist Modes, especially in difficult games, are a great idea to get more people interested in your game.
From my experiences, Hades comes to my mind. It features a "God Mode" which gives you much more resistance to attacks, giving the player increased survivability, especially after every failed attempt. One of my biggest pet peeves in roguelites is that they often have a really slow early game, and I often get bored before I get to the meat and potatoes, because at least in the more challenging games, not knowing its mechanics can be very punishing.
I'm a person who loves a challenge, but I find games really hard to get into, when the start feels too slow to me. The God Mode feature makes going through the start of the game much less of a slog, and once I get a little bit more stuff, I can just easily turn it off at my will. I had a much easier time learning the game's base mechanics, and once I got a little bit of loot and I was more familiar with the combat, I could just easily turn it off and try out other playstyles, challenges, etc.
This is also partially what made Celeste a very successful game. It's a challenging platformer that many people may get stuck on, but the amount of leniency mechanics, and a built-in Assist Mode provide so many options to the player, that even if you have absolutely zero experience with platformers, you may still have a pretty good time with it. If you get stuck and find a part of the game unfun, you can skip it or toggle some mechanics to be more friendly to you, and with this you can still experience the game's story!
I can however understand sometimes when games don't provide these features, as it's not always easy to have these features without massive changes to the game, but if it's not that big of a deal to do, please consider adding those features. You're gonna get more new people in your game than you may think.
