In my experience I've found that in a lot of situations similar to this, it's because the person doesn't want to learn. And most of the time it's not even a deliberate choice they've made. They feel that it's too hard, complicated, and/or overwhelming, so their mind unconsciously kinda "turns off" the willingness to learn. It's almost always people who are 50+ but I have encountered the occasional sub-40 who's like this. 

Long wall of text example. I work in the Aus wagering and electronic gaming industry. Most venues that have some kind of retail wagering area (like a sports lounge or bar) will have a space for displaying racing odds information. Stuff like all the info for the various race meetings, the odds of all the runners, data on the horses like how many races they've run and their win/place ratio, the jockey and trainer names, etc. It's a shitload of data. All these form sheets are often printed out and hung up on wall boards, so all this info is mostly really tiny text. Any time there's a change, like if a horse was scratched from a race or there was a jockey change, these updates would have to get printed out and the sheets manually updated.

About 10 years ago they introduced digital form information screens. These units have a touchscreen and are connected to the internet, so there is so much more information easily available that is a lot more detailed. They also have detailed info for most sports stuff as well. No longer must people suffer with the tiny text because the pages are not limited by A4 paper size and support zooming and scrolling.

I frequently see older men, like 55+, using magnifying glasses and still struggling to read the tiny text on the paper forms. I've asked a few of them why they don't use the digital forms. They usually tell me that they "look too complicated", but they've never even tried using them. These things were designed specifically to be easy, but because they're technology, when these old men look at them their brains just automatically think "too hard" so they don't even bother trying. I've managed to get a few guys to try them out after showing them how it works and reassuring them that they aren't gonna break it, but more often than not they still refuse to touch them.