Direct quote from your original post: "There’s no point in waiting; there won’t be any discount to be had just by holding off until next month or next year."
There's your generalisation. No condescension about "critical thinking skills" required.
Yikes, another critical thinking fail. You’re trying to take a pricing strategy for one product line and over-generalize it to product lines that don’t employ that strategy.
As I mentioned in my last post, I was addressing OP’s complaint about the price of the mini 4 staying constant for four years. Indeed, as I mentioned it encourages earlier buying: "There’s no point in waiting; there won’t be any discount to be had just by holding off until next month or next year."
You can’t apply a pricing strategy for the mini 4–a same-model four year lifecycle, with no previous model sold alongside it—to a product line that has yearly replacements, with previous models still being available for sale as alternatives to the new models. Everybody knows if you wait for next year’s iPhone to come out, you can get a discount on the older models. That’s the ways it’s worked for years.
But that has zero to do with iPad mini 4; it doesn’t get yearly refreshes and the price doesn’t undergo stale-model discounts (due to newer models being released at the same price point). Mini 4 has been sold in 2016, 2017, 2018 and 2019. Not mini 4, 5, 6, and 7. So no yearly price drops on mini 4. If you wanted it in 2016 but waited until this year to buy it, you saved no money and screwed yourself out of three years worth of usage.
btw the standard iPad employs yet a third strategy: yearly refreshes at the same price point, with the previous model being discontinued. $329 iPad March 2017; $329 iPad March 2018; (likely) $329 iPad March 2019. If you wait a year, you’ll get a newer/updated model, but no discount; you’ll pay the same price.
MacBook Pro Touch Bar utilizes the same strategy—2016 13”/15” at $1,799/2,399; 2017 at $1,799/2,399; 2018 at $1,799/2,399; 2019: take a wild guess. If you wait a year, you’ll get a newer/updated model, but no discount. Buy if you need it now, wait if you don’t.