Firstly nice to have you here and it is amazing that you are interested in this topic. Points for going PoW instead of PoS are - Better decentralisation and security - in PoS in order to provide security you have to be centralised(we have visa for that what is the point? and Dagknight (parameterless...

Same, right around 50 mark, GPU-s are happy with this algo

Funny thing is Eth-s design goal for "solving trillema" was implementation of Ghost (Greedy Heaviest Observed Subtree) they just never fully figured it out But it is still in the roadmap for 2.0.... But ultimately POS shift was a terrible idea

FUD! DagKnight alone makes it the easiest 1dollar prediction Ive ever seen/did

That would be awesome!