update README with info on why WriteStream was removed

add links to issue page discussion the removal and also
link to the wiki where more information on alternative
userland write stream approaches can be found

README.md

@@ -460,10 +460,11 @@ db.createReadStream({ keys: false, values: true })
 <a name="writeStreams"></a>
 #### What happened to `db.createWriteStream`?
 
-Yes we have removed `db.createWriteStream` but not to worry, there is good reason for this. *Disclaimper*: if you are not in a stage where you are worried about performance but want a streaming interface
-into your database, please checkout [`level-ws`][level-ws].
+`db.createWriteStream()` has been removed in order to provide a smaller and more maintainable core. It primarily existed to create symmetry with `db.createReadStream()` but through much [discussion](https://github.com/rvagg/node-levelup/issues/199), removing it was the best cause of action.
 
-TODO: talk about performance and multiple writeStream implementations
+The main driver for this was performance. While `db.createReadStream()` performs well under most use cases, `db.createWriteStream()` was highly dependent on the application keys and values. Thus we can't provide a standard implementation and encourage more `write-stream` implementations to be created to solve the broad spectrum of use cases.
+
+Check out the implementations that the community has already produced [here](https://github.com/rvagg/node-levelup/wiki/Modules#write-streams).
 
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