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Z-Moves are like a Solar Beam Heatran option available to every Pokémon. Extremely gimmicky and redundant to use most of the time, but if you need to get rid of a specific target, they work wonders. For example, you can use Tapu Koko with Electrium-Z to kill most of the its "counters". Amoonguss for example, if switches in on Nature's Madness loses 50% health while taking a good chunk of damage from Z-Thunderbolt, which deals more than 50% and with a high enough roll even ignores the Leftovers/Black Sludge recovery, and this is without accounting things like entry hazards or sandstorm damage. Tapu Koko can do the same against a lot of enemies, even some like Ferrothorn that avoid the 2HKO from Gigavolt Havoc lack a reliable recovery to switch into a Nature's Madness + Volt Switch more than once.
Quite a few Pokémon can abuse this to let another Pokémon in their team sweep with the enemy walls broken. I think fast Pokémon will benefit from this the most. Another example could be Rockium-Z Terrakion, replacing the Rock Gem variant from Gen 5. Most people are overrating Z-Status moves a lot, while I think they won't have much use. Z-Moves should be used to get some sneaky KOs that the opponent doesn't expect. They can be pretty risky and heavily prediction based, so I can see their popularity actually ending up very low, but I'm trying to think of possible sets since their reveal instead.
As an aside Power Herb Solar Beam Heatran is now pretty much inferior in every way to Bloom Doom Heatran.
