The Necron generators have increasing power cost, exponential build time cost and are affected by decay handicapping the entirety of Necron economy.
I feel like one aspect could be removed. Obviously not the increasing power cost. Is the exponential build time cost really needed though? Could it at least be removed or lessened or capped (at like 300%). Or make Obelisks affect generator build speed in some way. Otherwise we have to deal with decay and that's ugly. I proposed paying for flashing decayed gens instead of rebuilding them to avoid some absurdities, but some people would oppose even that. Personally I think Necrons should not have decay at all. It is unfluffy (they are awakening not going to sleep, they are untiring) and they already are paying increased costs (time and money) for each gen so they are like doubly penalized. But that's just me.