IMO it’s a pretty verifiably correct and complex piece of software. There are all sorts of test suites but no greater one than comparing a page rendered to how it renders in chrome.

Also, and maybe more importantly, a browser is the kind of the perfect entry point for a lot of businesses.

If you’re for example hoping to build an agent that people rely on to manage their calendars, emails, book them vacations, etc.. a browser is probably the perfect form factor for that.

Or if you’re a AI lab and want to tap into training data behind logged in websites - a browser everyone uses is the ultimately what you need.

If you can build and maintain a browser from scratch with just agents then there’s no need to pay millions of dollars to hire away chromium engineers from Google.

The list goes on!