Any reason for more push from MS for Client OM and REST API during the SP 2013 portal solution dev

hi,
Would like to know, why Microsoft has put more emphasis on Client OM and REST API in SP 2013 portal solutions dev.
Is there any prticular reason for this.If we develop our solutions in Server Object Model any performance/scalability related issues would be appearing in the near future , once i "Go Live" of my portal ?
Any indications given by MS saying, "we wont allow ISV/vendors/ to build server object model based solutions in the near future".

The real question might be "how long will there be an on premise version of SharePoint?" or "will we move our SharePoint to the cloud in the future?" There is an obvious push to the cloud for SharePoint. While all indications point to at least one more on
premise version of SharePoint, as a best practice any code you develop should run in both environments, and that will limit you to the new app model.
As far as performance, traditional server side code runs on the web front end servers. Any poorly performing code would have a negative impact on the servers and users. Therefore, performance/scalability is up to the skills of the developer. The primary
change around the app model is to move all custom code off of the web front ends and onto the client or other servers (via web services). Using the app model you can scale the app servers as needed separately from the "SharePoint" servers. (and of course,
your code would might still work if your SharePoint environment later moves to the cloud.)
Mike Smith TechTrainingNotes.blogspot.com
Books:
SharePoint 2007 2010 Customization for the Site Owner,
SharePoint 2010 Security for the Site Owner

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Best approach for uploading document using custom web part-Client OM or REST API

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public void UploadDocument(string siteURL, string documentListName,
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Any reason for more push from MS for Client OM and REST API during the SP 2013 portal solution dev

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