What's the point? You can tell if someone is using Tor anyways from their IP.

Tor is not Tor Browser. Detecting outdated Tor Browser version would help you detect well-known vulns. Detecting non-TBB browser over Tor would suggest that side-channel attacks are available to defeat onion routing (eg. WebRTC leaks).

If you want privacy, use Tor Browser. It's the only privacy-friendly browser out there. All others have many holes and leaks and very little intentions to close them. Although Firefox has a "Tor uplift" project upstreaming patches from Tor Browser into Firefox's strict privacy mode.

I guess they can easily identify tor vs normal firefox(Especially with tls fingerprinting probably used by cloudflare). But the goal of fingerprinting is mostly to distinguish user. There can be sane use like collecting fingerprint to stop bot attacks from registering. But as we know selfish society today they are mostly used to collect data and show ads. And egregious browser like chrome has no incentive to solve this problem.

I did, but i personally don't care that everyone knows i'm using a tor browser. TBB is like a digital black block [0]: it is known i'm in there but nobody knows who i am in that crowd.

[0] https://en.wikipedia.org/wiki/Black_block

Tor's techniques also make it a monoculture. The smallest fuck up that makes you just a little bit more identifiable normally, makes you stick out like a sore thumb among TBB users.