"Some vendors still thought IPv6 had a broadcast address"
I have never known anyone working with IPv6 for more than a day who doesn't understand that IPv6 does not have a broadcast address. I do not believe any vendor writing a routing stack would fail to understand that. Though, I do agree in early days, they screwed things up. For example, Dell would not route RFC 4193 (FC/7) addresses around 2005. I had to rip out and ship back a dozen of their routers when I realized they weren't going to fix that.
I think you might be onto something about gear though - I've read that Amazon builds their own routers, and routing stack - which means they can't simply deploy a well tested/regressed IPv6 stack, they have to write and test it from scratch. The dark side of doing everything yourself.
I have never known anyone working with IPv6 for more than a day who doesn't understand that IPv6 does not have a broadcast address. I do not believe any vendor writing a routing stack would fail to understand that. Though, I do agree in early days, they screwed things up. For example, Dell would not route RFC 4193 (FC/7) addresses around 2005. I had to rip out and ship back a dozen of their routers when I realized they weren't going to fix that.
I think you might be onto something about gear though - I've read that Amazon builds their own routers, and routing stack - which means they can't simply deploy a well tested/regressed IPv6 stack, they have to write and test it from scratch. The dark side of doing everything yourself.