I still use both, and already knew about this change. Is it useless overkill to keep both? Probably. But Privacy Badger also enables the GPC signal to let sites know you want to opt out of data sharing under the CCPA and GDPR. (You can enable GPC in about:config in Firefox, but that’s a hassle to do on every device, and extensions can be synced across devices)

I’m sure there’s plenty of discussion to be had around the effectiveness of the GPC, but to be it’s worth it even if it’s just as a stat of users that care about data privacy. There’s also always a chance that something makes it to Privacy Badger’s Blocklist before uBlock Origin’s (although it’s probably more likely to be the other way around).