> The main reason people don't use credit cards to buy houses now is due to the credit limit.

No, that is definitely not why.

> Some people might think it's nice to meet the buyer/seller, but the only reason you really get together in the same room is to sign a bunch of paperwork at the same time.

I’ve never heard of this. I’ve never even heard of anyone meeting the buyer/seller for any length of time in a real estate transaction.