I've never gone out for Thanksgiving Dinner, but IMO the decision not to cook in itself doesn't take away from anything (except the stash of leftovers, lol).
But it is the specific abandoning of a major family gathering for the express purpose of shopping for material goods that I find objectionable.
In my case it was offset a bit these past two years by starting Thanksgiving early in the morning. Both years were spent with my daughter and her fiancée. We cooked all day, spending time together, and ate dinner. Last year I went with my daughter in her trooping through the stores, so I got a couple of gifts bought and spent a few extra hours with her. (I also waited in the line that wrapped around the store for her while she made quick side trips to look at other things.) So it's not as bad as it could have been. We had quite a few hours together. But if you show up at noon, eat a late lunch, then rush out to be st the stores that open at around 4 with their "deals" then Thanksgiving is reduced to nothing more than a big meal shared.
It makes me sad. Our family when I was growing up gathered in the morning, spent all day together - whether it was the women cooking last-minute stuff, adults chatting and catching up, children rushing in and out playing with cousins. We would eat a late lunch usually, then more socializing and family time, tasting of favorite goodies, until late - many of us staying over at my Grandparents' since it was outside the city.
So different today if the agenda is to be in the stores and ready to snatch up those limited goods within the timeline. I'm sorry, but I do find that disgusting.
But that has nothing to do with deciding to eat out. Forgive me if I made you feel that way. If we didn't have at least 4 people eating dinner, I'd probably consider going out too. Though I have cooked for 3 a time or two. The one year I was alone I actually showed up at a church that invited the public. They didn't have many takers, but I enjoyed the fellowship and stayed to help clean up and play games after and formed some friendships.