- You can check the transactions confirmation and other information such as the quantity of bitcoin you've send or received.
If you're the sender/receiver, you can check it anytime whether the coin that you use transparent blockchain such as Bitcoin or private one such as Monero.
- You can use it as evidence that you already paid or received.
True, but not really useful if the buyer/seller have intention to scam.
- Incase you've been scammed you can track him. (But you it needs a lot of work)
Simply knowing the bitcoin movement won't help since you won't able to get it back without professional/police help, even worse if the scammer use Bitcoin mixer.
- They can track you using your transactions via Blockchain
True, but as long as all of your bitcoin address which involved isn't connected to your identity/account, you should be safe. Bitcoin mixer also help.
- The transaction is not that much anonymous
Again, only when bitcoin address which involved isn't connected to your identity/account.