Does it need to be?

According to ReadWriteWeb it does.

They say:

Last week, VentureBeat reported that Twitter decided to hire Pivotal Labs, a company they described as a “quiet but impressive group of big-gun, for-hire developers.” Pivotal Labs have already worked with other clients like salesforce, lumosity, DiscoveryMining, Bringo, and many others.

I say:

Rebuilding should probably have been done a while ago, but at least now they’ve realised their problems and are working to fix them.