Playing in column 6 is strategically sound because it gives me a piece on the bottom row that could potentially be part of a horizontal win in the future. By expanding my presence across the board rather than concentrating in one area, I'm creating more opportunities for future connections. Column 6 doesn't set up any immediate threats for my opponent, and it allows me to develop multiple win paths. If my opponent blocks column 6 on their next turn, I can continue building in other columns, making my strategy more flexible.