When you are lying on purpose, you have to make sure whatever you say is accomplishes whatever made you lie in the first place. It has to make you look good, ma

When you are lying on purpose, you have to make sure whatever you say is accomplishes whatever made you lie in the first place. It has to make you look good, make it seem like something is not your fault and so on. Therefore, you need to consciously validate whatever your brain outputs when you ask for some bullshit to "remember". Maybe this creates a delay or makes people be conservative in what they tell you for fear of accidentally saying something inconsistent. If you had a false memory, however, your brain could make up details as it goes along and you would just say them aloud, without feeling nervous or consciously thinking about consistency and validity at all.