Historically, difficulty settings have been rudimentary in nature. You either get a choice of X number of settings from easy to hard, or the game simply is what it is. Whether the option of difficulty should be in every game – or no games at all – is a frequently debated topic. Try starting a thread about the Dark Souls series needing an easy mode and watch the internet explode in all directions.
Celeste may not have started it, but it’s the game that got me thinking about difficulty in a more granular sense. Since then, I’ve noticed other games that offer different takes on more nuanced difficulty settings.