Illusion of continuity

I read an article that included the following - "Through careful, mindful observation of this process of sensation overlaid with cognitive evaluation, it’s possible to tease apart the raw sense data from all the mental activity about it. And when you do this, you may notice that the raw physical sensations, which until now you had always assumed to be continuous, are actually absent much of the time. What’s happening is that raw sense data arise and pass away rapidly in little chunks, with gaps in between the passing away of one chunk and the arising of another. Some of those gaps can be quite long, relatively speaking, but normally you don’t notice this because all that mental processing about the sense data fills them in, giving the illusion of continuity." I have been meditating for about 6 years and attended several retreats but I still don't understand this on an experiential level. I dont think I have assumed them to be continuous. It just seems obvious to me that sensation isn't always there. I get an itch and then it's gone. I have a pain and then it's gone etc etc. maybe I'm misunderstanding this concept?? Does it mean that for example an itch that lasts for 10 seconds is not continuous for the 10 second duration? And same with a pain? Perhaps my concentration is not strong enough to ever notice this. I try to examine a sensation sometimes but an itch just seems like an itch to me. I feel I'm not making much progress,if any at all, with this stuff. I read about what is apparently supposed to happen, things you're meant to notice and experience, insights etc but my meditation just seems to be the same thing every single time. Sitting, noticing breath, thinking, noticing breath, itch, thinking, notice breath etc. It feels more and more pointless everyday. I don't seem to be learning to see the "true nature of reality" or heading toward "enlightenment" Why not? Where am I going wrong?