So, your plan in this case is to go buy a competitor's washing machine with the exact same flaw, which will perform approximately the same as the thing you're returning? Or to demand a full refund on something you've been using for five years, so that you can buy a newer product that's been released since? These don't seem like great solutions (the latter would be fine if you could pull it off, but good luck with that).
The other options here are "Well, I'll just not have a washing machine". Which you can do, but it will take more time to clean your clothes and cost more money after not very many washes at all (or you hand-wash, but then you're looking at 10x as long). Same for computers -- if simply not having one is an option for you, you probably haven't noticed the degradation.
So you're just going to let manufacturers cripple the stuff you bought, because of their mistakes/incompetence, and silently let them?
They should give you your money back, or replace the CPU with one that is as fast as your old one before they crippled it - ie. new CPU with eg. higher clock to compensate for the speed loss due to this fix.
If you buy a 1000lumen lightbulb, and the manufacturer has to lower the output by 50% because of overheating, they should either give me my money back, or give me a 2000lumen bulb which was crippled to 1000lumen, to get the original brightness i bought the bulb for.
In this analogy, the lightbulb manufacturer can't build a 1000lm bulb for a comparable price once they account for the overheating issue. The technology won't exist for, say, five years. No other manufacturer can do that either. They can give my money back, but then I still don't have a lightbulb. What am I going to do, buy the same one again?
One thing you might say is that this change happened even to lightbulbs I've had for 5+ years. I can buy a functional 1000lm bulb for the same price now, due to the march of technology! The problem is that I've been using the lightbulb for five years already. If you use a lightbulb for five years, and then it fails entirely, the manufacturer is never going to give you a full refund: why would they give you a full refund for a lesser failure mode?
The choice is not between silently letting manufacturers cripple stuff, and having non-crippled stuff. The choice is between silently letting manufacturers cripple stuff, and loudly letting manufacturers cripple stuff. You're welcome to do the latter, but your stuff is still going to be crippled.
The other options here are "Well, I'll just not have a washing machine". Which you can do, but it will take more time to clean your clothes and cost more money after not very many washes at all (or you hand-wash, but then you're looking at 10x as long). Same for computers -- if simply not having one is an option for you, you probably haven't noticed the degradation.