There's tons of direct and circumstantial evidence in support of their being tombs, which you would've seen just a small part of if you'd cared to read the information linked to in posts 6702 and 6711. Even tradition is more evidence than the poorly woven whole cloth manufactured by the fringe out of nothing more than their own wishful thinking.
Consider this, we already have a demonstrable construction and usage relationship between burial mastabas and the pyramids but we also have a difficult to explain away proximal one. Both Giza And Saqqara are loaded with tombs from the pre-dynastic period on up, interspersed with pyramids from almost as wide a spread of periods. Why would anyone plunk a powerplant down in the middle of a cemetery, or a cemetery around a powerplant?
Be that as it may, that has nothing to do with the points you responded too. You don't have to provide evidence for instance that nice white limestone and dull brown limestone have different aesthetic appeals, since it should be self-evident. You do however have to provide it before you can start calling things electrodes and talking like it was acknowledged that's what they were. The simple fact is the pyramids can be interpreted to fit tomb theory far more easily than any alternative theory, and even where one might possibly think they don't, they certainly don't require any more convoluted contrivances to do so than those others.