BitShares and Steemit are both highly centralized. Their architecture is very similar to a traditional server client set up: they have a small number of trusted nodes, and non validating clients that depend on them.

And the transactions in Steemit at least are generally very low value, with 1-cent upvotes and article/comment entries making up the bulk of them. In comparison, the average value of an Ethereum transaction is $10,000.

Centralized or not, they are still digital currency, or crypto coins, both use a blockchain. The centralization is a moot point, you are picking at hairs.

The value of the transactions may differ, but at least the Steem transactions are more likely to be 'real', that is to say they are transferring value from one person to another. See my earlier comment about how a large proportion of ethereum 'value' is merely shuffling coins between different wallets of the same owners.