If we've gone from thinking of it as essential to just "a" bullet, I'm happy. Now we can have a productive conversation about what other bullets this bullet dis

If we've gone from thinking of it as essential to just "a" bullet, I'm happy. Now we can have a productive conversation about what other bullets this bullet displaces in your toolbox, and whether that's worth it. I'm not claiming functions are bad, or classes are bad, or inheritance is bad (there is evidence of the last, but it's orthogonal to this discussion). I'm claiming freezing interfaces for compatibility guarantees is often a bad idea. There needs to be far broader awareness of what you give up when you freeze an interface and commit to support it indefinitely. It's about minimizing zones of ownership within a single computer. Right now our computers have thousands of zones of ownership, and it's easy for important use cases and bugs to fall through the cracks between zones of ownership. Freezing an interface fractures what used to be a single zone of ownership into two.