I think it is effectively, required for most hospital stays. Even a fully capable individual with all that is going on in a hospital would IMO find it really hard to hear every important word, understand every context, and would struggle to make truly informed decisions.
When my son was 6 he was in the hospital for an illness that we still don't entirely understand (thankfully he recovered completely and is doing well). My wife or I were there the entire time. We got updates from the local university, other doctors from other hospitals.
Just updating my wife with all the details was absolutely mind mindbogglingly hard to really convey all the information accurately. When we were there together it was even harder for her to keep up.. in person.
I felt like I had an advantage as in my line of work I do a lot of troubleshooting, so change this, observe that, check this after that, accounting for tradeoffs of making some decisions, and the methodology totally made sense to me. My wife not as much.
I feel like there's a need for a medically trained advocates to really help people with these kinds of things.