It doesn't really matter how it's NOW, the fact that it can become congested very quickly and go to $20 in fees and hours or days for 3 confirmations, it's way more concerning from a business stand point than any other benefit blockchains can have.
...and i'm not including Ripple, as it's not a proper blockchain.
Doesn't matter. Who guarantees that it will stay that way? Bitcoin just needs to go up or down a little and we are back to hour long confirmation times.
Yes, if two people are trying to rent the same place at approximately the same time. I don't want to wait two hours to find out that someone attempted to complete a transaction five minutes before I did, and their payment went through first.
https://dedi.jochen-hoenicke.de/queue/#24h
If you're going to use insults, keep them up to date, at least.