Maybe a little.
Are you saying that if I have been trained to cast a fireball into a particular 5' square, I should also have been trained to cast Feather Fall at the moment I am passing through a particular 5' cube? Because both spells would have received the same type of training?
i am saying that just as I assume training in fireball would include common "degree of precision" training that allows it to be accurate without need for roll to a degree of certainty defined as a 5' square (in the rules - obviously the training in-game would be far more accuracy based) so training in feather fall would include the training in timing needed to choose to pick a particular 5' square accurately too.
You could insert many number of other spells that require timing and placement, not just fireball. placement of a wall of force within a few inches of a door perhaps or various spells placed just right to interact with terrain in the heat of combat.
lets give an example that might be a little more clear... 70' corridors 5' wide ending in a T intersection with an also 5' wide crossing halway
you have seen an enemy just around the T, occasionally popping head out and doing their bowman thing
If your Hypnotic pattern 30' cube aoe is placed in that last 5' section that is within both the corridor you are looking down and the crossing path, its AOE will include 10-15' down each side and have an unobstructed line from orogin to target - the spell affects them.
if, however, you cannot place it accurately enough to pick a given 5' square and it is placed 5' back then the line of effect rule means it only covers like half of one 5' portion into each side and you have a much higher chance of failing to catch them in the area. This would even be true if Evards was being used with ready as a reaction.
Now, sure, that is not as critical life and death a bit as choosing which 5' spot to cast feather fall in, but i assume there was enough training for that spell and its placement to enable that choice to be made without roll for failure in the case of hypnotic pattern... just like i assume the same ability to pick the point at which feather fall is cast and its affected folks to within a 5' degree of accuracy.
i just do not see a reason why i should assume that one spell got its "training" to include 5' precision and the other spell did not?