It's definitely impressive, and it shows it is possible to build a new browser. I don't think it shows it is possible to build a new browser that ordinary people will use though. That requires implementing a gazillion niche features that Chrome supports, and compatibility with a gazillion broken websites.
Probably with web browsers the last 0.1% is 99.9% of the work.
A lot of us would be happy to have a browser that doesn't try to support the gazillion features of chrome and Firefox, if it instead gave us the ability to browse the web on our own terms instead of one company's vision of what the web should be.
I share the sentiment. Reality is often physical businesses now require visiting their website, sometimes even in person, and they just don't work unless the browser is Chromium based.
Literally today I had to upload a drivers license in person yet on my phone to rent a truck. Of course Firefox failed, and even Chrome glitched, yet Chrome could be made to work with it's alternate uploader.
Probably with web browsers the last 0.1% is 99.9% of the work.