True, and you can also be tracked by your payment method, but it doesn't hurt to have as part of a total system. Tunneling all your traffic can have some nice advantages, and depending on the network you're connecting to you can add some more creative layers. You can use TOR over VPN, too. To your larger point, anonymity requires a whole philosophy; just clicking a button on one technology isn't going to cut it.The persistent impression in the darknet community is that paid VPNs are simply too easy to abuse. It is inconceivable that some are not set up specifically as traps. I have never figured out which ones are trustworthy and I don't know anyone credible who purports to be able to do so.
I gave up trying to be anonymous a long time ago, however. It's too much work and IDGAF anymore. Come and take it.