RF and TE are not the same thing. RF can indeed have loss over distance. The point of RF is that it's a freeform API and allows people to work on a common system quite easily. It's a lot like the fluid API. That's why RF is a great thing. People are conflating the two because TE is an example of how to use it, unlike other systems where the power API was inextricably tied to the main mod which added it.
The Fluid Api is great. Different fluids have common properties. The abstraction lets us transport different fluids in the same pipes. Store them in the same tanks and containers. Very convenient for mod authors and it even have some effect on the players in the sense that it is easy for mod authors to add that compatibility.
But the fluids themselves are never really compatible. No player expect the ability to fill Conduits with BuildCraft Oil. You can't create a Tesserract with Seed Oil. Combustion engines don't run on Melted Emeralds. You can't turn Blood into BuildCraft fuel. A common Api is convenient for the mod authors, but it doesn't always affect the player.
The BuildCraft Api is arguably easier to use than the RF api, but it does mean that you get BuildCraft power and not a variation of it. The Api tries to enforce a unified feel for BuildCraft power regardless of how it is produced, how it is transported, or where it is used. The player should be able to recognize it and be able to learn how to use it across all mods that have it. I'm surprised to that you actually want it to go in the opposite direction for RF power.
The BuildCraft Api was also open once and it created a small jungle of different MJ power variants. Riddled with bugs and strange behaviors. We'll see how long RF will survive if mod authors actually start to implement their own set of rules.
The first author to have loss in RF will probably be slaughtered by the community, but I guess it could work if it was different enough. "Lupus Flax, anyone?"
Hmm, maybe it is about time we get the opposite of loss. Make cables that have an amplifying effect instead. Just make the cable long enough and a tiny generator can power your mining operations.