I hope you keep on "experimenting". If you do, you'll eventually discover that using W3C and WHATWG and EcmaScript official standards, without bundlers, is the most productive, most maintainable, most enjoyable path to stable future-proof software.

I've been doing it this way throughout. Never found a problem that needed JQuery, SCSS, or TypeScript. And as for React, well, who ever told you that a virtual DOM was better than the real DOM was simply selling you snow in Alaska.