I’ve seen how much attention Lego puts into designing and making their bricks and sets, as well as their general outlook, so combined with their better quality, fake Lego bricks is not something I want polluting or diluting my/my kid’s Lego.
Those "other bricks" are quite useful when you want something that Lego won't produce. For example gimp figurine for your Pulp Fiction diorama.
I think that everyone can pick whatever liked. However, the term "fake LEGO" is a bit weird, because the other manufacturers also have well designed parts LEGO does not provide...