Besides fee's. You wanna barter for every half hour of waiting time you cut of by paying extra for block time in an auction when you order your coffee.
You can charge the Tesla while you wait.
If you're looking for quick transactions, Bitcoin might not be the best choice. There’s a proposal called the Lightning Network (LN) that’s designed to solve this issue, but only a few have adopted it so far.
Here’s how it works.
https://lightning.network/
Instant Payments. Lightning-fast blockchain payments without worrying about block confirmation times. Security is enforced by blockchain smart-contracts without creating a on-blockchain transaction for individual payments. Payment speed measured in milliseconds to seconds.
Scalability. Capable of millions to billions of transactions per second across the network. Capacity blows away legacy payment rails by many orders of magnitude. Attaching payment per action/click is now possible without custodians.
Low Cost. By transacting and settling off-blockchain, the Lightning Network allows for exceptionally low fees, which allows for emerging use cases such as instant micropayments.
Cross Blockchains. Cross-chain atomic swaps can occur off-chain instantly with heterogeneous blockchain consensus rules. So long as the chains can support the same cryptographic hash function, it is possible to make transactions across blockchains without trust in 3rd party custodians.