It really just depends on if the hardware is "good enough" for whatever its purpose is. If the hardware today can locally run whatever models for your security cameras, it's likely they will still be "good enough" in 10 years.

Of course, similar to a 10 year old car or appliance, you will be missing any new features or bells and whistles that have become available in the meantime.

I agree; it's important to recognize that there are lots of use cases where computers have long since reached "good enough" and aren't really going obsolete anymore for those use cases.

My NAS is about 13 years old, the network switches it connects through are even older, and while 2.5GbE now exists I have no need throw out my "good enough" equipment to replace with something marginally faster or more power efficient. I don't even really need to expand the storage of that NAS anytime soon, because my music collection could never come close to filling it, my movie/TV collection isn't growing much anymore due to the shift to streaming, and the volume of other stuff that I need to back up from my other computers just isn't growing much over the years.