Unfortunately with internet browsers being one of the key things that computers have to use, the makers of the browsers are the ones that really dictate obsolescence of computers because once Chrome or even Firefox stops being updated on your computer, it's basically dead in the water. Apple also speeds this process up by tying Safari updates to the OS which means that once a computer can no longer get the newest Mac OS, it also can't get any more updates to Safari and you basically have to rely on third party browsers to keep that computer running.