[jondubois]

The second point "Shared data between requests" would actually turn into a negative when it comes to dynamic web apps; if you had to re-render a component in realtime and send the HTML for that component over the wire for every permutation and change of data (which will be different for each user), caching would be futile. Also, this will basically move cache consumption from the client to the server; which is worse for the company which has to pay for hosting.

Performance-wise, full server-side rendering is a huge step back. For dynamic web apps, next.js is going to drive up hosting costs massively and open you up to DDoS attacks because of server-side cache issues. I suppose it's OK for static websites.