Because the whole reason ZenCash launched was Zclassic doesn't have a funding model to fund development, 100% goes to miners - in my view, no chance of competing these days without a development funding model funded with a share of the block reward. But this is my opinion only.
Why not ZClassic? It's like Zen without the unnecessary extras.
Well ZCL is raw and needs lot of work and i do not know which dev will work for free on this. Some kind of developers funds are necessary for further development. ZEN is not cooperative as it is case with ZCASH. With maste-rnodes ZEN will certainly be much better than ZCL. ZEN team working on anonymizing of entire blockchain not only transactions..