Happy LiveView user here :) Can confirm it can be used in many scenarios. One of my favorites is streaming realtime data to a chart. I serialize my data as JSON in the LiveView template and read it back in from a Hook. Saves me time by not having to create a separate API endpoint. e.g.

  <div
   phx-hook="MyChart"
   data-days="<%= Jason.encode!(days(@balances)) %>"
   data-amounts="<%= Jason.encode!(amounts(@balances)) %>"
  >
   <div phx-update="ignore">
   </div>
  </div>