I think some people and also me in the past think they have to rate their skills somehow in a resume. Skill bars seem nearly perfect for this. When creating them the compulsion to make at least one bar 100 percent is strong, whether or not it makes sense or even can be true.
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Every time I see a candidate with a "5/5" that misses a question make me think he lied on his resume.
Same as you, I splitted my skills into 3 categories: familiar, experiemented and proficient.
I think some people and also me in the past think they have to rate their skills somehow in a resume. Skill bars seem nearly perfect for this. When creating them the compulsion to make at least one bar 100 percent is strong, whether or not it makes sense or even can be true.