BTC is actually not very practical for payments and transactions for 2 reasons :
* High transaction costs
* Slow confirmation times
The reason for the high transaction costs and slow confirmation times is because of the block size which is very small and thus makes the network congested with unconfirmed transactions which drives the costs up,
I agree with both of your arguments. And this just points to the fact that e need a radical change before we see crypto payments fully implemented across the world.