Why do you need 100,000,000 eu storage? Because you need more storage for more machines.. Especially when you have something like 8 ind. electrolyzers, 8 ind. blast furnaces, 32 ind. centrifuge (well even the 2048 eu/t from single AESU is not enough if you run all of these at the same time)
What's the reason of matter fabricator? it's sooooo EXPENSIVE.. because mass fabricator is too cheap. 166k eu per uum? .. man.. I need 256k eu to smelt 1 tungsten dust to 1 tungsten ingot..
Why do you need Fusion Reactor? What's the purpose of this? Hmm.. because spamming ultimate hybrid solar panels is too easy? yeah that's one of the reason, the main reason is to feed the matter fabricator, so you can make array of Fusion Reactors..
(ofc you can also do it with bazillion amount of windmills, solar panels, lava and other..)
Why some people don't like GT? because well... they just don't like GT lol..
Why I use default GT? because vanilla IC2 getting repetitive after some time (even after disabling GTG+ all free energy).. I want something different.