the death vision is probably the only annoying mechanic in the game

but you can avoid it by not sucking in the first place

it is not a series, btw. barely even a metaseries. Xenoblade has no connections to Xenosaga has no connections to Xenogears. Except being from the same group of developers and having some philosophical and thematical similarities. They are maybe a spiritual series, but that's it.

But you should play Xenoblade first because it's objectively best.