It has great importance for evolution. For example, most of the differences between chimps and humans are in non-coding regions, especially in promoters. Controlling development probably is as important a function as any other in differences between close species. Surely phosphorylation will play a role.
OTOH I don't know what there is to discuss. It's all very much speculative at this point in time. Some of it will prove good and some will fall by the wayside. It's too early.
Informed opinion or flatulence - take your pick.
The last comment refers to me.