Imho is comprehensible why they applied a fixated BP, but atm Z moves are much weaker than I expected. A 100BP Nuzzle would've been absolutely interesting, but a 100BP move without any secondary effect definitely isn't worth the item slot competitively. The same goes even for a mono-use 175BP thunderbolt, it looks better but it just isn't worth the item loss most of the time. As of now, I see Z moves as niche mechanic, especially for some coverage moves (or priorities, if they work) rather than a game-changing mechanic. We'll see.