For example, I only buy/use old high-end (for their day) business class laptops and put linux on them. They work for everything I need to write and surf.
I also bought an iPhone that was already a few years old and plan to keep it until it stops getting security updates from Apple. I also moved from Android to Apple not because I like iPhones better (I don’t, really), but because the years of security updates (versus maybe one or two, on Android) matters to me.
I recently got an Amazon Warehouse deal for a Moto G42 in decent condition for 158 Euros (incl. tax). I know this device has only 2 years official firmware support left but I put LineageOS on it and couldn’t be happier. I don’t need high end devices as long as I have a headphone jack, microsd slot and huge battery. Also my old and trusty Lenovo Thinkpad W530 from 2013 is still good enough for me with Linux. The only thing I don’t like is that I had to disable hyperthreading for security reasons cause it has a vulnerability and Lenovo won’t fix it anymore. But tbh I only notice a difference when compiling things and that doesn’t happen too often. I plan to use my devices until they’re broken beyond reparability.