Not that I like this system, but why is "you get to use the machine" not a reward?
Because a reward possessed by all machines isn't useful in distinguishing between machines.
On the TE subject I prefer TE because it "just works". After a long IT career that is something I appreciate. Conduits in particular just weren't better than conductive pipe, they actually worked when most of the time conductive pipe was busy blowing itself up simply because one chunk somewhere didn't load as fast as the others. I know kinesis pipes are much better now but that will take awhile to become widespread knowledge.
I don't feel TE needs to cost more just because it works. Making it cost more wouldn't making me use another mod that doesn't work at all some of the time. Furthermore, if a mod is going to "punish" the player like BC conductive pipe used to it shouldn't punish the player for things they don't have direct control over, like chunk-loading speeds.
On the AA itself it seems bizarre to complain about a machine that internalizes what vanilla minecraft does itself. Two buckets of water means endless source blocks of water, anywhere you want them in vanilla. The AA is just an interface to get that endless source of water into a pipe. This is another case where TE simply works whereas the BC alternative quite often doesn't.
On TE vs. IC2 experimental I only see TE getting more popular. It really feels like the gregtech tail is wagging the IC2 dog when looking at the changes in IC2-experimental. If they want to be more than just "that mod that makes uu-matter" they're heading in the wrong direction for most of us.