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> They don't have the awkward dash ('-') to mess with url encoding

Can you explain what you mean by that? I have experienced issues with " " as "+" vs. "%20", but dashes... ?

Not in URLs per se, but in HTML URL Encoded Multipart Forms, i.e. enctype="multipart/form-data"

ETA: also, when you put a UUID as text into a lot of search engines, it treats the dashes as token delimiters.