> What privacy has the average Joe user gained by switching to Firefox? None. They’re still using Google Search and (most likely) other Google products.

I don't agree with this part. Though the bigger point is that not using Google as a default engine is very user hostile - as everyone is using Google. Of course this isn't ideal from a privacy perspective. But setting it to something else will only frustrate most common users. When I think Microsoft Edge I think Bing - and I don't like Bing.