I'd also rather pay the Macbook by card due to practicality, but I don't understand your second sentence. Why would you walk around with a Macbook worth 3k but not with 3k in cash? Nobody knows that you have 3k in cash with you, whereas everybody can see you walking out of the Apple Store with the Macbook.
I don’t do it often; last time was when I moved to the UK without a British bank account and did not want to pay any transfer fees, which are quite expensive for larger sums (I had to carry enough to live one month and pay a first month’s rent before getting my first pay check). Another one was when I had to buy a computer after having reach the 7-days ceiling in my debit card (now you can increase it on the bank’s app; it used to be more complicated).
The first time, it feels a little odd, but then you realize that nobody at the bank bats an eye at you withdrawing a few grand, and $3k in 100s is about the size of a phone in your pocket.
Since nobody carries cash, nobody thinks that other people are carrying cash, so it doesn't make you a target. And I'm not anymore likely to lose my wallet with $500 in cash in it than I am my $1000 phone.
Thugs will target older people who are more likely to carry cash, they do some stereotyping other of people who are still worth mugging.
Also, if they notice the wallet bulge in your back pocket, you’ve become a target.
And anything that doesn’t look like a wallet probably won’t trigger a response. You would be safer to just wad up money and shove it in your pocket than to carry it around in a wallet.
I've been on this site for a long time, and as far as I can recall this isn't accepted.
"It's for your own safety."
If it's a ride shared by several strangers, everyone can be handcuffed, too, so everyone keeps their hands to themselves for an added safety boost.