(See my more recent edit below)
I'm a soft "yes" on these changes (opinion only, since I am not a witness). I'm not enthusiastic, since I do not think they will solve the problems they identify and/or are not necessarily the best ways to address those problems. I'd rather experiment through many SMTs rather than guess on which tweaks will work for our one big petri dish; that one-size-fits-all approach has not worked too well. But on balance, they will make Steem slightly better.
EDIT: After further consideration, I have turned against this set of proposals. They do not make Steem better; they hurt it and should be rejected.
Not a witness either but I'm inclined to agree with most of your viewpoint on the subject.