Agreed on a lot of counts. The old way of doing things though was typically in my experience (compact) solars -> IC2 storage -> converters -> Teleport Pipes -> converters -> stuff you actually wanted to power.
Now as far as the storage goes, the "Minecraft justification" I am using is that when you interact with a redstone ore in any way, it glows. There is some sort of Kinetic -> EM spectrum conversion going on there. Piezoelectric if you will - heck, redstone is fairy dust anyways, so I'll roll with it. Hence why systems that need kinetic energy must have that energy stored in molten redstone.
As far as engines/generators go, in real life these things are regulated and have a torque-speed response. (Hence why the TE engines throttle down as they do, and other BC engines increase their piston pump speed.) Mechanical or electrical, doesn't matter. There are optimal points on the curve and very often a required trajectory along it. Additionally, there is a forced synchronous rhythm that multiple machines must adhere to - in most power grids across the world, this is 50 or 60 Hz.