Yes, indeed, the pause buffering topic is a controversial topic that is discussed time to time throughout the many shmup communities in-general where, to my understanding at least, one pauses before certain attacks, then analyses them to figure out a strategy to get past certain attacks, it was around those lines. Many who are arcade traditionalists, among other competitive type peoples, and perhaps others, are against it, for the reason that it, as they say, destroys the arcade experience, as well as giving the player unfair advantages, up to where it gives the player time to "recover, or calm one's nerves or such," so to speak (Yes, that is actually even considered cheating by some) so I understand it as, and that's a couple of the arguments I've seen. These sorts of discussion about it really do get heated quite often. I, myself, didn't know that pausing in a game could actually be considered cheating by some until a couple months ago, it was unbelievable, let's put it that way.
On that topic, there was a thread I came across some time ago on another forum (shmups forum, I believe) where the topic of pause buffering was discussed as part of fair and competitive play, and at a certain point on that thread, it got really heated, and it descended somewhat into a flame war, so yeah, pretty serious indeed. It's a serious topic, you'd be surprised.