I used to buy a coffee from time to time with bitcoin.
But I can't use bitcoin buying a coffee now, because the fee is so high, if I keep 0.0001 fee like before, it would take days for the transaction to get confirmed, I've got a transaction which took 11 days to get the 1st confirmation last month.
It's not cost-effective any more to buy (I mean both online and buying face to face) thing via bitcoin. And this is why I quit buy coffee with bitcoin.
This problem because people in rush to get their transaction to be confirmed as soon as possible by adding more fee, so yes ; low fee transaction more likely won't ever be included in blockchain block. The days for spending bitcoin for pennies has ended as bitcoin price reach ATH this year. Who want to buy a cup of coffee but have to add another $1 for fee but it takes longer time to receive.