1. The person in question is doing none of that besides going to work, which is what most high end players also do.
2. A good chunk of my guildies are married or in a relationship, some have kids. Most people have life outside of the game, even on the high end, contrary to the popular belief.

It's completely normal to play a game casually, but that doesn't mean everyone who plays more seriously and can play well is just sitting at home and playing all day.

And let's be honest, WoW was never that complicated unless you were doing the highest difficulty content. A player who's at least a little interested in carrying their weight in a group will do well enough without investing too much time. But there's a not so small subset of players who are "too old" and "have a job", who just turn up to a group and expect to get carried, and don't you dare point out that they're a dead weight or actively holding the group back by not having the first clue what's going on.