I can see why you would be iffy having to spend tera on something like a Weavile or a Meowscarada, but you don't need to tera every time against these mons if they don't have spikes.
Additionally, the thing that allows for Apple not have to necessarily do much is that the standard stall 5 it's built around is already really strong. The only thing you really need with the stall 5 is something for, well, knock off users + spikes. This is where Apple shines because that's really all it needs to do, but it can do even more by being an early-game check for mons like Kingambit.
Overall, if you're building a standard stall structure, your last slot needs to have good anti-hazard stack counterplay, which is what Apple does well. This is worth the tera in my opinion because a lot of hazard stack teams do not have the firepower to force a tera with other mons anyways.