I have both 6 and 12 points in 1/4, 3/8 and 1/2 drive. I predominately use 12 points, they seem to be easier to get on bolts and have less fit problems in tight areas as they're slightly thinner. By and large, they work. Occasionally, they feel like they are giving, so I switch to a 6 point.
The reality is that except for dirty, damaged, or really tough fasteners, the 6 point advantage is mostly academic. It's easy to blow it entirely out of proportion on an internet discussion board.
12 point sockets work. That's why we use them. 6 point also work. That's why we use them. The fact that individuals develop preferences for each type, and then argue them on the internet doesn't make one good and one bad. They both work. In a very small subset of the entire range of use, one might work better than the other. That doesn't make the other one bad. Both have circumstances where they work the best, and both have circumstances where they don't.
A complete set would have both for the circumstances where they are needed. An adequate set would have either 6 or 12 points, and they would work for probably 95% of the time.