http://www.elevatesoft.com:8081/maxgridtest/maxgridtest.html
(our server is in Chicago - SingleHop is fantastic)
Yes, you do make a valid point that things like optimistic database updates can be problematic, if not planned for. However, I would counter that the end result is much more durable and scalable than the alternative. If you build your application to handle distributed, optimistic transactions to a back-end JSON-based API (our dataset API does about 98% of the work for you), you're well on your way to having a distributed application that can be run anywhere and maintains a nice separation of concerns where the front-end or back-end can be swapped out as different needs arise. That, to me, seems to be a much better position to be in than one that requires a mix of both client-side and server-side content generation, which intimately ties the front-end to the back-end (brittle).
I like to deal with client-side apps which talk to a simple JSON API. It's a lot less hassle than dealing with this over engineered server side bullshit.
This Redux flux capicator, isomorphic, 4 Terabyte NPM install, 45 Babel plugin, flow, dumb component pure functional, immutable js, virtual dom. Now that's over engineered.
I built more complicated stuff with Knockout.js in 2011 then half the stuff I see people building with React(which from what I see is just news sites and forum software)
Just because something is possible doesn't mean people are actually using it. To make some optimistic updates you have to duplicate logic on client and server. It just gets really hairy especially when you're using auto increment id's in your database. That's just one of the problems. The complications it creates isn't even worth it. I'd rather just put a server in London. A lot less hassle then dealing with this over engineered client side bullshit.