Lightroom is paid software, or even worse, it is subscription based software. You can get the non-cloud based lightroom 'classic' with a 9.99 a month sub for photoshop or a 1 terabyte cloud based lightroom without photoshop. If you are serious about photography it is very useful, there are alternatives though. DXO Optics Pro is paid software (about $130) that also has the lens correction and Lightzone which is free and open-source but does not has lens correction as far as I know.
What makes Lightzone so useful compared to photoshop or the camera's own software is its catalogue features and ease of use, once you have thousands of photo's it is really handy to have a very good catalogue feature. It is more like a digital darkroom and much easier to use than photoshop because sometimes less is more when you want to have a fast workflow.