I was sternly told by a nun that, with my handwriting, I would never get a job.
The only thing in my entire career I've ever been asked to write something in cursive is my signature, which I reduced to a squiggle for efficiency reasons. (The history of signatures is fascinating, BTW. Illiterate Charlemagne "signed" documents with a single horizontal stroke of the pen, inside of a premade 99%-completed "signature".)
I am employed, and she's long-dead.
I've seen a suggestion that a signature is now nothing but a signal. An agreed-upon way of communicating "this is serious and binding". Being able to point out that a signature was faked in some cases is a rare side benefit at best.
If papers were signed, then something was agreed upon. A trade performed, a commitment made. If no papers were signed, then it's just idle talk.
That's all it ever has been; it was dressed up as a legible, personally-styled literal composition of one's name for a few centuries.
Many of the signatures throughout Europe's premodern era were crosses - anyone can make a "t" shape, everyone knew what it meant (and what it implied, morally), and it was as valid for this William as it was for that Henry because it was witnessed by state-recognized authorities (Notaries, if you will).
Egyptian signatures weren't written BY the person signing, but if you had your own cartouche, ain't nobody faking that... Wax seals only had names written in Latin print. Thumbprints were used in China, and handprints in paleolithic France.
Modern web interfaces give up on the "draw something like your signature with this janky software" bullshit, and fall to "just type your own name and we'll assume it's you."
All are societally-recognized authentic signatures.
I have a corporation in Japan, and I have a set of fancy old-school stamps.
Charlemagne wasn't exactly please about that state of affairs though.
Signatures seem to be completely useless. Like you, my signature has devolved into a squiggle that is never the same, and it has never mattered.
I remember experimenting as a bored young adult with my first credit card, before tap to pay, when you often had to sign with a stylus on a terminal (in the US) - I would sign something different every time, sometimes nonsense, sometimes a little drawing, sometimes writing “Obama” or “Einstein” to see if I’d get a call from my bank or something - never did.
Maybe there was an era when actual matching signatures mattered, but it seems long gone.
I guess if you’re a celebrity signing autographs then it matters.