Why do so many people push changing browsers over using something like arkenfox? As far as I know, librewolf is essentially firefox with arkenfox preconfigured.

While I understand that setting up a config is probably beyond the scope of your average browser user, I rarely even see the alternative mentioned. Nor do I rarely see people mention the downsides of using a downstream branch - mostly security updates potentially being late.

If you use fennec on android, I think you can even just copy your config to your phone and have it working the same there.