I recently was in an awkward situation when ordering my new passport. Most times I got to sign some papers I have some signature which is a few waves, not forming many letters. In the passport office the clerk told me they can't recognize any enough letters in there, so I had to do multiple attempts till they were happy ... now my passport got a signature I won't be able to replicate ever.
(I do some handwriting for notes taking, but that's some writing based on block letters, not script as in a signature)
>now my passport got a signature I won't be able to replicate ever
I'm not sure I could ever prove I am who I say I am using my signature. My wife signs my name most of the time when it's necessary for a check or a health form for the kids or whatever. Whenever I go to vote, I try to sneak a look at their copy of the form to see how I signed it when I registered. I think my credit union has one 'on file' for me, but I'm sure it's nothing like how I actually sign my name and is from ~25 years ago.
This is a very strange requirement, to be honest. E.g. what about foreigners whose native script is not the same, so their (pre-existing) signature is unparseable to that clerk anyway?
FWIW I have a signature that is barely recognizable as my two initials, and I have never had it rejected on such grounds in the five different countries (using two different scripts) I've had to sign documents using it.
(I do some handwriting for notes taking, but that's some writing based on block letters, not script as in a signature)