Comment 46 for bug 176125

I must admit that I hadn't heard Ron's name before but Google tells me that he definitely has some experiences with IPv6 on large scale enterprise networks :)

He's got more or less the same arguments you have and I'm still not entirely convinced ("the RFC says so" is also not a good reasoning) since I still think in enterprise networks you've got the advantage of some control over your clients and can disable PE globally (just create a file /etc/sysctl.d/99-no-pe.conf) or block PE enabled systems. OTOH does the average home user know nothing about PE and how to enable them. (Well, not that the average home users uses Ubuntu but thats a different problem.) So I still think the advantage of not being easily trackable on a global scale per default outweights enterprise needs to track people locally. But until somebody else with better arguments than me speaks up, I'll shut up :)

I guess what really would settle this issue once and for all would be another flag in the RA to disable PE (cf. RFC 5175).