This. I built my last company on elixir. Deployments of clustered BEAM in cloud VMs are far more complex than load-balancing across node or python servers, not to mention serverless. Any custom genservers we wrote always had stability issues. Type safety was a problem that caused crashes in production. Elixir is a really fun language and BEAM is powerful but it’s by no means a clear choice. My new company is on Next.js and it’s much easier to hire / develop / deploy.
It's funny how this works, I will never work with Next.js ever again (after doing it for years at multiple companies), I find it to be a total mess. Compared to how José Valim and Chris McCord (and others) lead Elixir and Phoenix and Vercel / Meta handles Next.js and React is night and day and I have close to zero trust in the latter. But then again, Next.js a tool to sell Vercel hosting and React has its own roadmap to cater to Meta, both of these are obvious perfectly valid and it's not a secret so people can make their own choices.
I don't know how many times I've done a minor update of Next just to have some undocumented internal change break everything, and reading their release logs are a joke, who thought it would be a good idea to just dump badly written git-commits and call it a day?
As an anecdotal warning, unless your team consists of TypeScript masters with extremely strict ethics you will end up with type safety issues too, they will just be harder to find (and if things go bad crash your runtime or client execution) :)
Being easy to hire for has actually been a massive downside personally, it's very hard work finding people who actually know how to build a good React app, not to mention a Next.js ditto, but you'll get an near infinite number of applicants with skills "matching".
Jump to Elixir might be a bit too much. You could get strong type safety and scalability with ASP.NET Core without sacrificing productivity you are used to (it's also way faster than BEAM).
