Though any slowness you see isn't the actual blockchain or witnesses. Steemit is a centralized website, as are busy.org, esteem, chainbb, zappl, etc. All just different ways to LOOK at the blocks on the steem blockchain. So if website slowness is why you think it isn't scaling well that actually has nothing to do with witnesses or the blockchain. That is simply a centralized website problem.
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Yes, it does require service from the witnesses which are distributed and with many backups. There has been no disruption of that service or the speed of the chain since it has been running. There have been down times for websites though. This is easy to test as when Steemit appears down you can jump to busy.org and things are clipping along at a nice speed, the same is true when busy or some other site goes down.