I know you intended to be helpful and didn't mean to be unkind.
But, this site is called Hacker News, and it's always been one of the site's most important roles, to feature and celebrate novel and interesting projects that people hack on, for whatever reason they choose.
There are all kinds of things that can be learned by starting with a blank slate and re-implementing something as ubiquitous and foundational as a web browser.
Over the years, many users have enjoyed undertaking a course called "Nand to Tetris" [1]. I hope to find time to do it one day. I don't expect it will make me substantially more employable, but I think I'll enjoy learning about the fundamentals, and I'm sure it will be beneficial in my work somehow.
Please let's remember that the playful exploration that happens through a project like this can lead to all kinds of benefits that might be non-obvious, and that it’s fine to appreciate the effort for its own sake.
[1] https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...