Yeah, I think number 4 is pretty important. The blockchain API access has too much lag and too many errors. This is particularly important for app developers on top of the blockchain. There's a couple of well known services that I've used in my app development that have unacceptably high levels of failure and errors. I'd put it down to those services themselves, but I've seen similar error rates from my own programming interfacing directly with the steem API. It makes app development (and debugging) very hard.