I am a solo dev. I wrote a complete warehouse management system. I wouldn't be able to accomplish this in a relatively short time frame without help of framewo

I am a solo dev. I wrote a complete warehouse management system. I wouldn't be able to accomplish this in a relatively short time frame without help of frameworks and libraries. Instead of using vanilla SQL queries I used LINQ. For UI, I used bootstrap, because it made it easy to handle desktop/mobile. For async calls I used old jquery because it worked well enough with .NET and was well documented. Additionally .NET allowed to scaffold models and identity. I can write a site in JS/HTML/CSS, however, why? I would rather do things quickly with proven frameworks. Size of websites is less of an issues these days. There may be use cases for going pure vanilla but often not the case from a business perspective.