Exactly.
I know plenty of people who use Apple products such as iPhones and Macs and have to stop using them and throw them into landfill basically because there are no further security updates, although the device works fine and is fast enough for their needs.
Shortening security updates absolutely has an environmental impact.
You can just install an open source distro. The environmental impact is user laziness (which is pretty much true of all environmental impact)
It's not a ton different on the Windows/android side. The TPM 2.0 requirement for Windows 11 took a lot of our work PCs out of the rotation.
This. I have an old 2012 Intel Retina Macbook Pro which is already several MacOS versions behind and I’m unable to update it through normal means any longer. It works fine and it still has the best looking screen of any laptop I ever owned.
I keep it at my parents’ house and I maybe use it 3/4 times per year, but it’s enough for my needs when I’m visiting and it feels wasteful to throw it away or store it for good. I fully understand that it is a 14yo machine and it is unreasonable for a company to support old hardware indefinitely, but still, it does feel like a waste.