Peaches has it right. Every time I hear someone talk about how manufacturers purposefully design stuff to fail to force consumers to buy more, it makes me grit my teeth because the reality is much simpler. Manufacturers for many consumer goods stopped building stuff to last because it costs more and consumers stopped paying for mid-range quality a long time ago. The example of a $70.00 toaster is a perfect one for this, because it has to sit on a shelf next to the $15.00 toaster and people looking at both can rightly think, "Will the better one really last four times as long, and will I care that much if it doesn't?" Such quality cuts make things cheaper to build and the flip side (that it's usually not worth it to repair such an item) is just a side effect.
For items like computers or phones, quality isn't the issue, it's complexity. The reason why an old flip phone outlasts a newer smartphone is that it's quite literally a hundred times less complex inside, to the point where the computer power inside the modern phone's battery is better than the main unit on the old phone. That means there's less to break down, but people these days demand more from a phone than they ever did in the past because it's there to demand. My old Commodore 64 still works fine, but it's got less processing power than my alarm clock. New computers don't break down faster because of some conspiracy, they break down because they're doing the work of several hundred thousand of the older computers in the space taken up by a postage stamp, and to get the same level of reliability at that size, you'd need to spend a quarter million dollars on building it and nobody would buy it.
If you want quality, it's still out there. If you want a vacuum cleaner that lasts forever, go find a professional grade model and for home use it'll last 30 years. The down side is that it'll cost $1200.00. Throwaway levels of manufacturing quality are just a sign of the times. When the state of the art advances as quickly as it has over the last few decades, that's just how it goes.