They will be gone with time, but not because anything that Valve does. Microsoft is locking down the kernel after the CrowdStrike debacle. In a few years it will be impossible to run any custom kernel code.
For me it wasn't some boss or something. It was just some ridiculous precision platforming that couldn't get past. I'm 45. My reaction times aren't what they used to be. And the fact that you have to fight your shade every time made it just that much harder.
Ori and the Blind Forest also had some difficult precision platforming but the instant reload and no death penalty made it much easier to just try dozens of times until you get it.
Fallout 4 is the worst with this. I never found nished the game because of that. Multiple nukes square in the face of a supermutant and he's just at half health? I ain't got time for that.