Failure on the Swiss flag:

https://en.wikipedia.org/wiki/Flag_of_Switzerland

The Swiss flag is square, instead of the rectangular shape typical for national flags.

Even if it were to be the civil & state ensign, the cross must remain "quadratic" with the horizontal and vertical arms the same width. They clearly aren't, and it looks horrible.

I recently had a misfortune to draw every country flag with a limited palette of shapes (axis-aligned rectangle and triangle, ellipses, {a/b} regular polygons) and operations (union, subtraction). [1] It is really annoying to be as faithful as possible; you have to deal with varying aspect ratios and under- or unspecified construction methods and colors, and at some point you have to decide how to modify the flag to fit the target resolution and aspect ratio without being too different. Also you would eventually have to face the flag of Bhutan [2]... (I haven't yet drawn it.)

[1] https://github.com/lifthrasiir/unison/blob/gh-pages/font/fla...

[2] https://en.wikipedia.org/wiki/Flag_of_Bhutan

Theres no license in the repo so its basically unusable.

Hasn’t been updated in 5 years. The Syrian flag for one is out of date. There could be others.

Sri Lanka's lion has no sabre and looks like a terrier. UNUSABLE! /s