Well, as usual it depends. It depends on who is your target customer and what they value. Here in Hacker News the login page is completely barebones and it's OK. In other cases that won't pass, but a login page using the stock tailwind components (or another library) will be enough.
In general, I'd say that picking a good library of components is necessary for most projects and it will take you to the proverbial 80% results with 20% effort.
In general, I'd say that picking a good library of components is necessary for most projects and it will take you to the proverbial 80% results with 20% effort.