Is Anyone Using Subwoofers the Same Size as Their Mids?

Ever since I moved my listening room, I’ve been struggling with subwoofer integration. I know there are several room-related problems I need to solve and in the meantime, I am not using a subwoofer. Recently I made some system changes and realized my 6.5” mids actually put out some decent bass and because they don’t dig quite as low as a true subwoofer, they (mostly) get around the room issues. It made me wonder if I could simply add more identical drivers (6.5”) and tune them to subwoofer frequencies (e.g. high pass at 80-100 Hz, for example). Perhaps even get four of them and build a distributed bass array. In theory, they should integrate beautifully with the mids since they would be identical drivers. What am I missing because this seems like too good of an idea for other people not to have done it? Does anyone have any experience with this?