I always hear the argument "you don't need a fancy website or UI, when I started my site/app looked like ___"
These people created MVPs in 2010. You're now competing with MVPs that can be built with way more features, the latest tech stacks, and more in the same period of time.
What makes you want to use Elixir, Phoenix, and LiveView? I've never even heard of these before
Back when I dabbled in web dev in college, people only talked about the MERN stack lol