The point, in my opinion, of Oval is not a deep state plot but obscuring information from passengers. If I want to go into London from Reading and use the tube, it will cost £35.40. With a paper ticket, I will clearly see that price in bold letters on a screen (or rarely these days, counting out that money at a ticket office) and printed on the ticket. Knowing the price leads to the question of is it worth it - do I value this journey at £35.40 or not? For some people, the answer will be no (or just this once but I'm not paying that again).
With contactless, I just tap a card and go. No idea that my days travel may cost £35.40 (or less, or more). While it can be found out what the cost is, most people won't bother. Nor are most people going through bank statements with a fine tooth comb. So the question of is it worth it doesn't arise for the majority. It makes the railway more like car travel, where each journey has a cost but it's hard to calculate so the cost is underestimated or ignored.