This is the answer that I wish to never have to see ...
Don't ask the questions if you don't want the answers.
negletting problems is the worst way to deal with it!
You stated a few things that weren't true, and then asked why bitcoin was no longer doing what the whitepaper said.
I pointed out where you were wrong.
That has nothing to do with "negletting problems".
do you think it's normal a fee of $60 to transfer $15?
No. I think you are foolish to spend a $60 fee to transfer $15.
However, I support your right to waste money in that way if you wish to.
Do you think it's sustainable?
Think what is sustainable?
Bitcoin fees are designed to be self-sustaining.
If the fee is too high, then less people will send Bitcoin transactions. If less people send Bitcoin transactions, then there will be more room in the blockchain at lower fees. If there is more room in the blockchain at lower fees, then more people will send Bitcoin transactions. If more people send Bitcoin transactions, then there is less room in the blockchain at lower fees. These opposing financial incentives force the blocks to fill up with transactions at exactly the fees that are sustainable (because if they are not sustainable, then there will be less transactions and therefore cheaper fees).
When you pay with cash you need to pay a 600% fee on the transaction? (or 6000% if I want to buy an icecream?).
I don't buy icecream with Bitcoin.
You are welcome to do so, but that seems like a poor choice of transaction for a system as important, significant, and expensive as Bitcoin.