I think bottlenecking is the main problem with other types of transmission. Especially when powering transporters or mass fabricators. However this whole chunk loading business is something thats screwing with my plans for large scale power networks. (essentially a grid with multiple up and downloading points). Anyone know a way around this aside from using MFSUs all over the place? (which would introduce a new bottleneck....)
The only thing that I can say is build vertical, not horizontal.
Its not all that great, but if you have a 63 deep minable area, you can have 31 walkable levels, multiply that by 81(9 by 9 chunk area right?), its still far more than enough.
Either way, MSFUs are still somewhat realistic if you consider transformer substations in real life.
Its not too bad, especially if you are willing to build a small solar plant by every MSFu to power it in absence of your main power plant.