The simple answer is, browsers are brutally hard. Browsers have to support an almost infinite amount of instructions, whether it's html, css, js and now wasm, n

The simple answer is, browsers are brutally hard. Browsers have to support an almost infinite amount of instructions, whether it's html, css, js and now wasm, not to mention the insane amounts of apis, protocols and so on. I mean just open the developer tools and think of the insane amount of work that would have to go into developing something like this. Even Microsoft with thousands of developers at their disposal and finances to double them with a snap of a finger, figured that it's not worth developing a browser engine in-house. That alone speaks volumes.