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Pros
Pro Offers ppa
When using a browser, with all of "dangers" lurking out there, it is important and vital to keep a browser up to date. Firefox, the browser that LibreFox is based on, is for some Linux users available if they also have snap installed (Canonical flavours). Not only does snap deteriorate the browsing experience, but with no snap the danger is there that the Firefox is out of date. Next to the "privacy hardening profile" that Librewolf has, it allows updating with a ppa, thus being always at the highest safety level. Not a "lack" of Firefox, but a practicality solved by Librewolf: still Firefox, but convenient and hardened.
Pro Still Firefox, but no telemetry and Google
Although Firefox is a good browser, it has some significant privacy concerns. When installed as default, it sends considerable amounts to e.g. Mozilla, Google and its partner abut you. It is of course possible to adapt this if you dive into the settings and profiles (e.g. prefs.js, user.js). However, if you can't do this or don't want, Librewolf is an option: it offers the a very good browser with those privacy profiles already set for you, like coming with uBlock Origin and DDG as search engine preinstalled.