Hi Geoff, as stated on the demo, the observe mixin was inspired by zone updater but with a few very handy differences:
1. Developers don't need to deal with request parameters. These are converted to more user friendly event arguments. 2. You can pass multiple clientside field values. In the jump-start example you could get rid of the @persist usage with this feature. 3. Optional context, you can use the same serverside event for multiple observe instances or pass the loop index etc. I realise that jumpstart has far greater kudos than stitch. Would you consider adding these features to jumpstart?
