Hi,
I have just watched this video https://steemit.com/steem/@germanaure/the-tatiana-show-ned-scott-of-steemit-dr and I read the white paper the other day(click Steemit logo, top left of screen to access).
I'm no expert, but as I understand it, the blockchain has a couple of major advantages over the system you describe:
There are no need for advertisers and therefore advertising bias, it is the blockchain rewarding you and not a fickle advertiser, who might suddenly decide they don't like your content and don't want to reward you.
It is harder to game the system, the blockchain gives voting power sparingly and therefore you don't get a situation whereby advertisers are prepared to set up digital sweatshops of people upvoting content (like on Facebook)
We are all contributing to the blockchain and so even content that might not be "advertiser friendly" can make a valuable contribution.
The blockchain is generating wealth and represents the company, we can all be part of that in a way that we couldn't in the model you suggest.
Whilst it would be far easier to have your bank account attached, the fact is, this is a very easy route into the world of cryptocurrency. You are being given a front seat ride, in a really nice vehicle. You will have to go through exchanges, however if you are a successful poster, this will be become a moot point, as money, is money, is money.
Plus think of it this way, imagine if Facebook had started this way, would you be that interested in how quickly you could liquidate the assets that Facebook were giving you just for posting?
Maybe I'm totally wrong, like I say, I'm no expert, but watch the video, he comes on about halfway through.
CG
RE: What is the advantage of steem using a blockchain?