You raise some good points but in real life, how often do people need to do any type of "maintenance" on solar farms as opposed to a nuclear reactor where you have shit tonnes of computers, fail-safe systems, security guards, etc?
See where I am going? I would argue that simply raising the EU/t output of the nuclear reactor (maybe 3x or 4x what it is now?) should make sense if GT is all about making us regret playing Real Life, I mean Minecraft in the first place.
At the end of the day, this is a sandbox game. Greg can do whatever balancing he wants. I realize, however, that there will still be whiners and complainers at the end of the day, regardless of what he does. You just can't please everybody.
Though you are technically right, solar farms still require quite a bit of maintenance, as is with anything that is highly technical and located outdoors. Failsafes and computers mean less manpower is required to maintain the system as electrical systems do everything automatically. Your points actually make it easier to maintain things with less work. i.e. Why my entire FTB career is tended towards those types of automation, simply because I am only one person.
In reality, solar trumps all other methods by such a long shot, for any person who has to compare their achievements to others (say, on a multiplayer server) it makes it hard to justify going the "hard" and less "efficient" path. That's why I play SSP, do what I do.
The attempt to make solar harder by making them more expensive is null. It just makes it take longer to get there, but the exponential growth of the energy gains trumps making any increase to the initial investment moot. Nuclear reactors increase their energy gains linearly, i.e. if you add one more reactor you get x amount of energy. With solar, upgrading one solar to the ultimate provides 512 EU/t which is ridiculous. Going from 1 EU/t to 8, 64 and finally 512 EU/t... I have 160 combustion engines running full time and can only output a max of 980 EU/t (I think right now). Though I myself am not complaining, you can see how two solar cells, attached to two pieces of wire, to two MFSUs beats my system of iron tanks regulating the flow of biomass, biofuel and lava into each of their respective stages, etc.
But that's fun to me. To make things overly complicated because that's what I have to deal with in my profession and playing FTB otherwise is too simple. Not everybody is a problem solver, hence why not everybody is an engineer.