The focus of my argument was less on Petrifex being the default for competetive lists and more on no matter what you do it's automatically going to be a competetive list that requires an equally competetive list from your opponent. Every subfaction should be able to be less competetive so people who like that subfaction for other reasons than crunch can use it without having to feel bad playing against weaker lists.
There's a huge difference between lists being competetive because they include a specific combination of units, relics, special rules etc, and a list being competetive simply because it's from a specific subfaction.