> Nevertheless, I left a bit concerned that they hadn't updated their Chrome in 3 years. Software decays much quicker than hardware in a real way, especially with the never ending list of security vulnerabilities found every year. Theres definitely a case to be made that forcing software upgrades is good for the end user too.

It seems very easy to understand the logic here. What part don’t you grasp? Don’t support older versions => this pressures them to upgrade => upgrading is good for their security.