A major reason why 1-shotting was so prevalent

[Ratsplat]

While working on my late game builds, one thing becomes very apparent. If you want to just simply stack up a ton of damage, you hardly need much in the way of Lumina. However, if you want to adds lots of utility, defenses and such, you require so many more Lumina points.

Now, the cost makes sense if you want to stop people from having everything AND deal a ton of damage. But if you want to make a fun build instead of only damage, you have to go through a lot more effort to build it.

In theory, since many +damage Luminas also came with downsides like increased incoming damage or the inability to heal, they were much cheaper to use. Unfortunately, if all it takes is 1 round/1 attack to win, then the player was never going to be in danger to begin with.

I think that if Luminas had been balanced better, where you could actually stack up utility and defenses, the allure of 1 shotting everything wouldn't have been as strong.

[Jester]

Makes sense. All the good survival pictos like Cleas life as an extreme example eats like 40 luminas if I recall.
Obviously you're gonna for damage pictos which cost less.
*Edit not to mention that you're Lumina points could be spread out on five characters.

[Spawn of Apathy]

honestly, I struggled with getting the timing of dodging down, so I pretty much avoided parrying entirely since the window was even tighter. As soon as I could one-shot I started doing it. The best defense being a good offense and all that. This may be true for many others. How cheap the builds were to make were secondary to how it allowed me to get through battles with less frustration and fewer retries.

[IvoryTemplar]

The devs had an ongoing challenge in the office to see who could do the largest single hit.

We have 1 shotting because the devs wanted us to have it. It's that simple.