I'm just focusing on the res here.
I don't think it is an inconvenience (to someone who wasn't used to practically constant res's), I think it is asking for a level of planning. Across a single boss fight which lasts between 5 to 10 mins you will have 4 emergency ressurects from your groups non healers, and your healer should be able to res 2 to 3 times at least, probably a bunch more. For fights which last longer than that, peoples cooldowns will begin to tick back around.
We're not going to balance the game taking heavy latency or client lag into account, as it again would trivialise thing for people who have a good machine/connection. The performance of the client is something we hope to constantly improve, but there is nothing we can do about bad internet connections.