@webprofusion Good reminder and perhaps I am taking this a bit off-topic but ...
Won't it have to become standard practice for IIS admins to configure their systems to send longer chains? I mean the Chrome root store is now encouraging root rotation every 5 years (see here)
Public CA can't readily ignore what Chrome store requires so longer chains linking to very fresh roots will become more common. At least how I see it. What do you think?