If Dark Souls had easier difficulties, they wouldn't have the reputation they do. People would turn down the difficulty instead of learning the bosses and how to beat them.
The games aren't as hard as people make them out to be. They just force you to adjust and learn to play in control. There's a reason people can play them with all kinds of goofy input options, though. If you pay attention to what enemies do and don't blindly spam attack every second, they're all beatable
Apple doing their own wouldn't result in any of the benefits people want. The open spec doesn't support shit.
It's not a good standard. It's not a mediocre standard. It's complete fucking horseshit that only works with Google's proprietary implementation.
Apple supporting RCS would be a massive betrayal of their customers. It's not remotely redeemable.