Yeah, I saw this last night. Absolutely brilliant point, and really important.
Pass accuracy seems to be linked to pass distance rather than anything else - in 2017 and in 2018 too.
In 2017, to generalise a little, there were no misplaced passes, only intercepted passes, and they were only intercepted when they had to cover beyond 30ft. 2018 seems to be largely (but not completely) the same - a 1-2 pass will never ever be misplaced, because the logic seems to be "short pass = simple pass = 100% success rate".
There isn't any other pass accuracy logic beyond that, I don't think (and even if a player's passing attribute is terrible, it seems that this encourages the pass to "snap" towards the opponent, as opposed to being ~6ft behind of / ahead of the target, for example).
The passer being under pressure, or having to hit the pass first-time, isn't a part of the calculation. It's why all the passes (and shots too) feel so unnaturally perfect, I think. It makes players feel like robots.