The automobile was more convenient than owning a horse. MP3 is more convenient than dealing with CDs. Try actually using cryptocurrency and it rapidly becomes apparent that it's far simpler just to whip out your credit/debit card, or good old cash. If you're buying something online, PayPal's more or less got your back if the seller screws you over. Ordered an iPhone and received this instead? File a claim.
The only reason anyone bothers with Bitcoin is because they believe a bigger fool will buy the Bitcoins off of them at a later date, or because they're buying things (contraband merchandise) that they don't want legitimate payment processors knowing about. Most legitimate businesses that accept Bitcoin simply use a payment processor that immediately exchanges the Bitcoins for cash, and generally you're the one eating the transaction fees on both ends (unless you get lucky and Bitcoin fluctuates up in the time since you exchanged cash for your Bitcoins).
If you really want to live in the brave new world of electronic payments, get a phone with NFC and try using that for awhile. You'll quickly discover it's still more convenient to use a form of payment that's accepted everywhere (cash, credit/debit), rather than remembering which merchants have functional NFC equipment and fumbling with your phone.