If you're not using Tor browser, why not?
@hache >or really why it would be necessary for my purposes...
That depends entirely on your purposes! The more people there are using Tor, generally, the stronger the network is.
You can use tor to anonymize your web traffic, to send and receive files anonymously (using onionshare), and to host websites on your local machine without having to deal with DNS or security certs. It makes it harder for companies (and others!) to track you, when used correctly.