I agree this would be great, but there are some potential problems I can see.
1. There would have to be storage for the names of all channels of all blocks in a preset, taking up memory in the unit and maybe the FCs, and potentially increasing preset load time.
2. Depending on how preset data is stored, that might require significant changes to that data format, a whole other can of worms.
3. To be most useful, channel names would be displayed on the FCs, and should change in the FC mini-displays when you changed channels or scenes. That's a lot of ongoing overhead.
I'm just spitballing here, could be off base on all counts, but those seem like basic consequences to adding channel names.