Nextjs is the trojan horse sent to destroy React and it worked
It is marketed as the solution to slow starts but React is slow so the solution is terrible over-engineered.
A much better fix is to remove React and use something that is already fast like solidjs or Lit. There are much better UI Kits in Lit that I have seen in React and in the end it is just JS so the same people that can could React, can code Lit and SolidJS.