SirSengir is not the creator of BC whoever said that, Spacetoad is. Sengir appears to be leading maintaince for the mod.
As for the energies both have their place and could by no means be merged. That being said I'm pretty sure that we really only need four energies, redstone, electric, magic, and beam(BC and Xycraft). Redstone should just be a basic signal in my opinion simple on/off I hate that Mojang wants to make it an electrical system. Electric should be complex and take effort to understand and use, simplicity is bad for it but it should power higher tier machines (Gregtech). Also can be used for more complex signals like the comparator. I'm sure magic energy systems will be added eventually some could argue that essentia is one already but more machines and processes (like enchanting or soul shards) need to be added to balance any magic vs tech. Beams are the simple "oh thats cool" of the energy world, engines should not produce these beams maybe solar for a little, geothermal, anything that seems energetic. It would take effort to reach but is easy to use once you get there, beams would power engravers powerful lights, furnaces, xycraft-ish stuff, probably some random laser stuff and in my opinion mffs. However physical machines do physical work (grinding, extracting, compressing, building) should not use lasers. They are two different areas. Additionally a physical system (cogs of the machine) would be great for early electrical and redstone signals.
This sort of grouping is something really attempts to do but it ends bringing much more content and possibilities. The thing is no one system can please everyone. Some people don't like magic, others think redstone is too complex for a good output, others don't like over-realistic feel of electricals and others still dislike the unbelievability of lasers. No one system is all of those but why can't people choose if they were grouped appropriately rather than all over the place. One system for each not three. Connections between systems are great too, magic could produce beams, beams could heat up an engine, and a machine could pump out magic energy. Obviously all would be affected by redstone too.