Is it though? Or is it just because we are used to it? Let's pretend bitcoin is all you've ever known, and then someone comes along and says "Try this new money called fiat. I'll keep it safe for you and give you this card. If you want some you have to physically get in your car and drive to the nearest mall/gas station/whatever and put the card in a machine and the machine will give you cash." No one is going to think that is simpler than making a bitcoin transaction in 30 seconds from the comfort of your own home.
You are right, we are used to it. In the words of Bane, we have been molded by the way the system has worked for generations.
In my country there is a saying that goes something like:
It's easy to switch from a donkey to a horse. It means, that it's easy to get used to something better and more efficient. In terms of simplicity, bitcoin is not the horse, it's the donkey. In your example, you talked about using an ATM to get cash, so let's stay with that for now. I was talking about physical bank notes, but it doesn't matter.
Imagine explaining to someone who has never used an ATM how to work the machine. Where to get the card, how to get money onto to it, put it inside the ATM, enter your PIN, select how much you want to withdraw, put the money and card in your pocket, and off your go. If you run into any problems, contact the customer department and they'll sort it out. If you lose your card, it gets stolen, or you forget your PIN, they'll help you out.
Now it's time to explain bitcoin to the same person. To use bitcoin, you need an appropriate wallet. But you can't download any wallet because some of them are fake, and you'll end up installing malware or get phished. Your computer also needs to be virus-free because if it isn't, you can lose your coins. Let's say he is using Electrum. Now it's time to verify that what he downloaded is the real deal. Check the signatures and make sure the software was signed by the developer. To do that, find the developer's public key and use another software, like Kleopatra, for the verification. Only after you have done that, you should install the wallet. The long strings of letters and numbers, those are your receiving addresses. You can't change those to something that has any meaning to you, like a username on any website or app. The even longer strings of numbers and letters are your private keys. It's of the utmost importance that no one sees those, otherwise they'll have the needed access to your money. The 12 words you saw when you created your wallet, those are called a seed. You shouldn't save your seed digitally like you do with all your other computer files because your public and private keys are all generated from that seed and whoever has it, ultimately owns your money.
Now it is time to fund your bank account or Electrum wallet. To put money on your bank account, you go to the nearest branch office (same place you got your card). Give the clerk a $100 bill, and he deposits it in your account. You are all set.
You can't buy bitcoin for your Electrum wallet from the local bitcoin store as there is no such thing. One option is purchasing coins from someone P2P. That now opens the door to being scammed if you are doing it online or getting robbed if you do it face to face. You can also use a middleman, but that costs extra. Or you can use a CEX or DEX, and we all know what can happen with your money and personal information on exchanges.
The last step is buying stuff. With your card, you swipe it through the machine, enter your PIN and you are done. No extra fees. If the item costs $100, that's your total cost. With Bitcoin, you have to ensure you are sending to the correct address, and each transaction requires a network fee. If your fee isn't high enough, it will take a long time before the recipient gets his money. If the network is congested, you could pay an additional $5-10 or more in fees for a quick confirmation. If you mess up, send to the wrong address, send the wrong amount, lose your seed, there is no customer support to turn to, and every transaction is irreversible.
For you, me, and anyone else used to both the traditional and untraditional ways of transferring value, neither of these two scenarios would present too big of a problem. But what do you think the imaginary person who has never used either would pick? The horse or the donkey?
I had this once when trying to buy tickets for an event. By the time I went through the process, the tickets were sold out. Wouldn't have happened with bitcoin.
That's unfortunate. Bitcoin could have helped in that scenario. But I will repeat, your tickets would also have been a tick more expensive with Bitcoin. Many people have to consider all these aspects while purchasing something. And who likes to pay more if he can pay less?