How do I deal with an under performing co-worker?

One co-worker, let's call him Bob, does exactly one thing, and if he encounters any problems, there's a less than 50 % chance he can solve them by randomly reinstalling a service or by contacting the right person. More often, he tries reinstalling until he silently gives up without telling anyone, until someday someone notices and raises a ticket. He's also several years longer on the team than I. My boss tells us to involve him in more topics, to broaden his horizon, but deep down he has to know that will never work out. I certainly tried, but I learned that Bob only does exactly what you tell him to do, does it only partially or in the wrong order, and forgets half of it anyway, because he lacks a real understanding of his work. I also learned to not care anymore. His job is safe, and that little he does is at least out of my feet. It doesn't affect my work too much, and it's ultimately not my responsibility to make him a more valuable employee for the company. Nice guy in most other respects! Another co-worker, Bill, is new on the team, also a very nice guy. Eager to learn, or so he says, but from what I can see, he's very happy to only do what he's already firm in. We sometimes give him more complex work items and ask him to invite all the relevant parties, and he dutifully schedules all the meetings, but never takes the lead, never does any of the things himself, always listens to the discussions other people have. It's all very inconsequential. Bill is still young, he can still grow his skills, and a time will come when it's no longer enough to remain as passive as he is now. But I fear he's lacking a strong intrinsic motivation, his inner fire so to speak, to improve his professional skills, to think ahead, to get to the bottom of things. Maybe I'm too hard on our Bobs and Bills. It's just that I sometimes invest huge amounts of time in troubleshooting or development: Narrowing bugs down, reading everything there is on the internet on obscure error codes, chaining commands in just the right way to make even the most stupid requests possible, sharing my findings with colleagues, creating tools for them, discussing pros and cons. I simultaneously love and hate everything of that, because I solve real problems and help real people by doing all that, but I also feel that in doing so I encourage them to never question their routines and to shift all the difficulties that entails to me, because surely that must be my job, to fix their problems. I fundamentally don't get Bob's and Bill's thinking, I could never work that way, but maybe they are right and I'm not, and in the end, it's just a paycheck and there are more important things to worry about.