The governments will love it because it allows for perfect surveillance, the people will love it because it makes international payments seamless, it can erase the predatory remittance business out of existence. If they can convince merchants to accept it, they can also improve on credit card UX.
I can understand the benefit of this from the standpoint that it will be essentially a global currency, which will reduce transfer times and just generally make it easier to send money, however I don't understand why a blockchain is involved. We already have similar solutions (Paypal, Transferwise etc), is blockchain just a way to market this thing?
Blockhain is a technical convenience - the Libra Association consists of 28 members. Everybody is more comfortable with money being stored on the public ledger rather than on a database server owned by Facebook. Blockchain is useful in cases where a collaborative/adversarial relationship exists between multiple parties. In this case this is regulators, governments, Libra association members and users. Blockchain keeps everybody honest, compliant and ensures data integrity.
It also removes some of legal responsibility from Facebook because they don't actually process the transactions themselves, it's peer 2 peer.
Not will, but can. I did a transatlantic SWIFT payment recently and it cost me $9 in correspondent bank fees. I did another one and it cost me $0 in fees. I did another and it cost $18.
In each instance, I was able to get a SWIFT trace by asking the emitting and receiving banks to provide this. I didn't get a receipt for the SWIFT fees correspondent banks charged, but I did get receipts for the bank fees at either end.
Banks do suck, and the payment networks also suck, but sometimes they can suck less.