I’m pretty surprised, I think Boulderhead Mawtribe looks phenomenal. The 40k Equivalent of Dig Deep You Heels! completely shifted the Meta for years and I think people are really understating the advantage of how Might Makes Right applies to BCR; namely, that unlike Gutbusters, BCR monsters model count is always 10, regardless of how many wounds that unit has suffered, as opposed to losing models as they take damage. Especially since there’s no way to bring those models back unlike in most armies.
This may be a Grass is Always Greener thing for me though as I’ve only played Gutbusters and only recently at that.