Blood mage even with lifeleech patch is still very bad feeld to play

Subject.

Please consider to:
1. Swap crit multy and crit chance nodes in the tree
2. Merge Life leech and Sanguilmancy nodes into one
3a. Make mana cost SPLIT bewtween life and mana, and not double mana cost as life cost
3b. Make life ramnants to be REALL way to sustain life. Right now I have like 13 crit chance nodes and use cold spells and still barelly survive on trash after casting something like Frostbite + Comet

UPD
Among top 1000 players in standard there is 20 bloodmages and at SSF 27. this is total of 2.4% population of ascendancy and I'm sure there is many people who play that ascendacy for cool factor