Hmmm. On one hand, having so many trials for each type did feel excessive as an idea, and there certainly was not enough space for it. On the other, its gonna need one hell of a story, and one hell of a reason, for just seven. Okay its the same size of a normal region, but when considering how things are spaced out, and were everything is located, I just dunno how the hell it can work. Like up till Akala, things are all good, but then UlaUla which alone could be the later half of a Pokemon game only has 2 trials, and then the last bit only has another? The final island is fine desu, as there is likely a lot of story stuff going on there, along with the final confrontation with the legendary, but Ula Ula really makes no sense. If Electric and Ghost are its trial types, then why a giant desert which is perfect for a ground trial? Why the Ice Peak? Like, both Ghost and Electric don't adhere to them being natural places for trials, as they are likely at the power plant and the abandonded store in the south, but the rest ARE natural dungeons, so they could easily have had more trial captains and trials to expand on the whole island exploration thing. Incoherent rant, sk to make it short:
Nothing makes any fucking sense with 7 trials, cause they could easily have 10 natural trial locales and a number of building trials, but they aren't. And I am not even going to wonder why 7 and if z crystal distro will make sense, cause it probably won't.
