You can be very passionate about programming and not have side projects, but the inverse can also be true. I have side programming projects, but I also have many other interests which compete for my time. When I'm already coding 40 hours a week, it's sometimes hard to justify doing even more when I have an array of other things I'd like to do.
That said, if you don't at least find joy in programming at work, that would probably show in your interactions with colleagues and cause you to stagnate somewhat.
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