I think having a direct Composite output could be used with for example car monitors or other things, I don't see why it shouldn't be supported out of the box and it might work on all H3-based boards, some of which have a dedicated pin inside the headphone jack. For example Orange Pi PC. Also, composite video is supported from the start on a Raspberry Pi Zero, which also requires soldering to get it to work. I would say that more people are able to solder one pin rather then search the whole internet how to compile the whole kernel with patches. The video pin on the Orange Pi One isn't really that hard to access as it is on the bottom of the board.