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Can we all agree that the 1936 Soviet flag is OBJECTIVELY better than the khruschevite garbage they concocted up in 1955
(lemmygrad.ml)
In the end it doesn't matter, since i uncontrollably 
whenever is see either of them
I hate that check list, not gonna lie
A good flag should be aesthetically pleasing to me, who cares if a child could draw it? A flag is going to be printed by a printer, sown (rarely if ever this century) or displayed on a screen, not whatever child labour system was previously relied on.
Your list: 1. Unique. 2. What does reasonable even mean, give me a vapourwave flag pls. But check anyway. 3. Great design. 4. The design is the words. 5. Nope.
My list: yeah it looks great, no need for a contrived list to justify saying something looks good because some nerd thinks it's easy for a child to draw 50 stars but not a hammer and sickle