Digital signatures make a lot more sense as digital signatures.

And you can counter-sign the time if you need to prove that.

They don't even make sense there. Since you can digitally sign things without blockchains or NFTs.

The blockchain acts like timestamp proving the digital data existed prior to when the block with the hash was mined.

Sure, it does do that. But I can't think of many scenarios where proving something was signed at least at a certain date is particularly useful. Usually when you are signing something you have two parties involved so you can just write the date on the document and if you lie the other party will call it out.

NFTs seem like a solution to a non existent problem. Or a problem you have to search really really hard to find.

pgp keys already took care of that 35 years ago