[mechanical_fish]

You may notice that I carefully elided C to Objective C when selecting examples of things that change. :)

I'm also not sure this is a counterexample. It's just the opposite perspective. From the perspective of a parent, a three-year-old becomes a thirteen-year-old with terrifying speed. A cell biologist would note that both kids are built from the same parts, many of which are also shared with killer whales and the front lawn.

My examples are all easy to flip in this way. The most remarkable feature of iOS is that it is directly descended from the twenty-five-year-old Next system, to the point that it carries all those cute little "ns"es around.

Change is constant, but provided one escapes the traps of lock-in (oops, Adobe Flash, dang!) and resists the whims of fashion, the change can happen slowly and piecemeal. If a new Golang library is important enough, it can always be ported to C later for the benefit of one's great-grandchildren.