"For that price, you can just use an old laptop" has been true ever since the OG Raspberry Pi showed up ~13 years ago.
And that's great, and stuff, if what a person wants is the most compute they can get for the fewest dollars possible.
But when someone instead wants a quite small computer that is actually friendly to hardware tinkering, and they want to buy it new, then a used Thinkpad will not scratch that itch -- but a new Raspberry Pi will.
(It's a bad comparison. It always has been a bad comparison.)
Any laptop you could buy 13 years ago for $25 would probably be parts only. So no, that's not true.
13 years ago, we only had the Raspberry Pi Model B at $35 (about $50 in today's money -- same as a 2GB Pi 5), and just as today we still needed to get all of the accoutrements in-place to make it work: A power supply that it actually works with, a case, an SD card, perhaps a wifi adapter...
My time machine is a little rusty, but all that and a breadboard was about a hundred bucks around that time: https://www.linuxjournal.com/node/1206862
Or, you know: About $150 in today's money.
$150 is plenty to buy a used PC system here in 2025 that still works, just as $100 was plenty to buy a working used system in 2012.
As a point of reference: The last used system I bought was a little Lenovo M600. It was $50, delivered, a couple of years ago.
As another point of reference: My daily-driver laptop is a Thinkpad T530 that was ~$200 (I paid a little extra for a disturbingly-clean example that included a discrete GPU and the fanciest of the screens that could be equipped).
Anyway: I saw these same discussions about pricing back when the first Pi was still new -- just on Slashdot instead of HN. People have been comparing the prices of used PC hardware to the prices of new Raspberry Pis for as long as we've had Raspberry Pis.
(And to be clear, I'm not trying to fanboy anything. This isn't Highlander: There can be more than one. I've got Raspberry Pis that do stuff, and I also have PC hardware that does stuff, and I'm OK with this.)
if you use the raspberry as computer(instead of developing platform), why buy breadboard and other glitter ?
The OG raspberry, with some cheap $5 mouse/keyboard, a $10 microsd, and you have a working computer for less than $50
The OG Raspberry Pi was $50 in today's money -- for the bare board and nothing else at all.
There is nothing to discuss whilst real factors like inflation are willfully ignored.
2012 was a long time ago, and these boards were not as inexpensive as rose-tinted glasses may suggest.