But, a multisig vault can have some advantages compared to the singlesig wallet
I agree with most that you write, I just want to add some video of Andreas about multi-signature:
MultiSig is NOT the best option for most people to store their bitcoin [June 2023]Also Multisignature transactions need more space and it waste more fees each time that you want to create a new transaction.
As experiment it is OK and its up to each person to use it or not, but i think that a single 12 word seed and 24 words bip39 seed have enough security always that you don't leak or mesh up your seed
Yeah I have seen this video and I have also seen another one where Andreas says that multisig is an overkill for everyday people.
In my opinion it all comes down to usability. I would go for a multisig wallet, for its ease of use, even if it is more difficult to setup and also easier to mess it up. I think I know my limits well enough to choose it. But, as you said, people go for multisig solutions only because of them being more secure, but, nothing is secure enough if you make stupid mistakes, right?!