In baseball, coaches and managers are all ex-players, but not necessarily good ex-players. (Well, anyone who plays in MLB is “good”, but relative to the rest of the league I mean.) Just like in other industries, the skills required for a good coach or manager don’t always correlate with being the best player.
> I can't think of any sport where players are expected to become coaches.
In amateur sports it's common. E.g. in rowing, cycling, fencing, cross country skiing, etc., people are generally expected to coach at some point. Albeit usually while they're doing the sport, and not necessarily as their primary careers.
To some extent, coaching something you practice is good for giving you another perspective on what it is you're practicing. In an ideal world, this will elevate your skill level.
This does, however, not necessarily mean that everyone is a good coach, nor does it mean that everyone should stop practicing what they're doing and focus solely on coaching.
Football/soccer? Of course there are more players than coaches so they can't all become coaches, but I would say star players are expected to become coaches, and lots of them do.
Football team coaching staff are almost like another team. Position coaches usually are ex players of that position but as you move up the chain it gets more into strategic management and thus by the HC level it's more of a manager role with architects underneath for offense and defense so less position technical knowledge more game knowledge.
Well, only 1/3 of them played Pro before going into coaching. The rest were college players (and two only played in High School) who switched to coaching, mostly because they didn't get drafted.
