I guess it's how you perceive things and the mindset you adopt is where you're struggling. It's all about balance and what is deemed to be reasonable for most people. For instance, 99.9% aren't going to be driving a car that's 50 years old. But many of them will be driving one that's 3-10 years old which does exactly what they need it to. You're always going to the extremes, that's where you're going wrong.
My laptops perform more or less as well as modern ones for what is needed of them. I've compared and tested them. I accept that if you're using them for certain things, then a more recent one would be beneficial. But most people aren't using CAD, etc. Just out of interest - how does your recent laptop knock the socks off anything from 3 years ago? Because it weighs less than 1kg? I think that's probably where you're going wrong again.
I could keep going on - but my response was initiated by you questioning whether things can last 5 years. The clear answer to that is yes - and a whole lot longer.
It's not me going wrong, I'm the one who has three vehicles running on batteries, for far cheaper than their rival ice cars. Maybe the one going wrong is the guy with no experience who just doesn't seem to get it, so much to the point where it actually seems like a wind up, that's how bad it is.
Buying a car 0-3 years old and having a drive/ home charger is pretty reasonable to a lot of people, as I look out my window half the cars are younger than 2 years, and 50% of those are EV's. I don't expect the guy with the 10 year old polo to be buying a new 50k BMW i4 EV as he doesn't even want a 10 year old 4 series, he's happy in his 10 year old polo, good for him. He should be comparing to a 10 year old astra or whatever, and in 8 years time he can compare to a 10 year old EV if he likes. He's got no reasonable comparison now though, other than them both being "cars". Some people have a £200 car budget at 20% of their wage, some people have a £500 budget at 10% of their wage, each to their own.
Your laptop doesn't perform as well as modern ones (not for people who need a lap top), it will get hammered in every single benchmark test under the sun. Even if you bought a top 5% lap top in the world from 5-10 years ago it would still get hammered by something mid range now. With things like lap tops you're often better off just buying low to mid-range, but doing that more often, than top of the range and expecting it to last 10 years. Laptops from 8 years ago were about 1/3 single core speed and about 1/5th multi core, it matters, to those who need a lap top.
It might work ok(ish) for basic web browsing, and basic office apps but that's about it. It's going to be crap for anything using large amounts of files, working with files in the cloud, large file sizes, high res data, or searching e-mails etc. CAD (like AutoCAD) is a different ball game completely, even a £2k PC will largely struggle with CAD if it's not optimized (unless tiny files). You need to be spending 1-2k just on the video card alone for professional environments (to be stable), or you won't be able to work with the files which everyone else is. My 1kg laptop is faster, for every single one of the 20 apps/programs I use, more portable, better processor, more memory, faster Wi-Fi, more high speed ports, quieter (less annoying), cooler (less annoying), than a 1.7kg laptop which cost more, a few years earlier (or the 2.3kg one before that), and it's slightly smaller too, but with a bigger screen. My old laptop was scoring extremely highly on benchmark tests back then too. Maybe you have time to waste, wating for PC to come out of sleep, to boot up, shut down, to search for some files, but if I'm working, I don't. If it saves me an hour a day (10% speed) then it will pay itself back in a week. Portability is helpful, it allows more work, for longer, in comfort and becomes far less of a chore, effectively it allows more efficient use of time. I'm quite happy sat with my current lap top catching up on the sofa for hours, when the footy is on TV or our lass is watching some crap. But 3 years ago I wouldn't even get the old one out of it's case.
Some things can
last 5 years, but lasting and being efficient or cost effective to use or persist with is another matter, especially when considering quality, quality of life. Bricks will last 100 years and their function won't be any less than when it was first used, and are something which haven't changed much in a 100 years. The same doesn't apply to anything related to tech.