That's how thus industry had operated throughout its, albeit short, history and will continue to do so. If Twitter/Facebook survive another 10 years, they'll do the server-/client-side tango another two iterations at least.
It's faster, less resource intensive (from a revenue standpoint) and more easily targeted to isolated groups of users to implement innovative solutions on the client-side. Through testing and days analysis, those techniques can be vetted, with clear "winners" moving from industry-accepted best practices to finally becoming true open standards (20 years later).
Shortly after the transition to industry accepted best practice, we see the risk takers (businesses) internalizing those features back to the server-side so that their user base as a whole can reap the benefits. All while freeing up resources within their product (your client) to start the process over again on the "next big thing".
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That's how thus industry had operated throughout its, albeit short, history and will continue to do so. If Twitter/Facebook survive another 10 years, they'll do the server-/client-side tango another two iterations at least.
It's faster, less resource intensive (from a revenue standpoint) and more easily targeted to isolated groups of users to implement innovative solutions on the client-side. Through testing and days analysis, those techniques can be vetted, with clear "winners" moving from industry-accepted best practices to finally becoming true open standards (20 years later).
Shortly after the transition to industry accepted best practice, we see the risk takers (businesses) internalizing those features back to the server-side so that their user base as a whole can reap the benefits. All while freeing up resources within their product (your client) to start the process over again on the "next big thing".