most people don't realize but it takes days/weeks/months for most forms of transactions to reach the bank account of the store owner, often with huge fees. (even paper money) and risk of chargebacks.

paper money also bears risk of robberies (and theft from cashiers, even though almost no cashier is stupid enough to steal) so most stores don't like being paid in cash.

not to mention the problems with change.

Bitcoin doesnt have any of these problems.