I gave it a shot at one startup using next.js that wanted to pre-hydrate redux state, but also use tracking with session cookies et al the regular bag of beans. I spent maybe 6 weeks on it and basically I grew to realize I was in a miasma of pain. I didn't last much longer. I could've wrote the entire thing just vanilla js/css in probably a weekend... So I can commiserate with this.
I think a lot of people start things off thinking they NEED to have all the authentication, cookies etc sorted out from the get go when really you just need your ideas in a working form first and stuff like HTTP basic auth is mighty fine for development