Beauty /is/ in the eye of the beholder. The rationale /here/ is that the more text in a page the more code you'll fit in your head the more you'll get done, the more confidence you'll have and again the more you'll achieve.
Zero code is in your head if you can't read it.
The predominant monitor in existence is your average 24" 1080p monitor, sat at, on average, 32" away from the head. The average person has worse than 20/20 vision.
You must test your website in such conditions and make sure it is readable, and also make sure it meets at minimum WCAG A, but preferably the whole way to AAA if possible.
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OP has a valid point. On my Mac, it's unreadable without zooming in. I immediately left the page.