Local-first apps aren't common because teams building web apps are primarily targeting online, database backed, SaaS. With the exception of messenger clients,

Local-first apps aren't common because teams building web apps are primarily targeting online, database backed, SaaS. With the exception of messenger clients, Desktop apps are mostly "local-first" from day one. At the time you're beginning to think about desktop behavior, it's also worth considering whether you should just build native.