I find myself using it only for specific tasks such as simplifying code from others, explaining code, using a API or library without crawling the documentation, getting errors explained or finding new functions in the given language.
Complex Answer: Depends on your product or service you are offering, is it only used on the mobile phone? Does it require native functions of the mobile phone? Will customer expect this product or service to be on the mobile phone? If the answers to those questions are yes, I would do a mobile app.
Otherwise I would stick with a web app. This spares you the hussle to build for two ecosystems.
I have been using React with Nextjs, Prisma, Nextauth and Tailwind. The development experience is amazing.
Frontend as well as the API is in one repository, that helps to iterate fast and deploy as you go.