What a fascinating planet you must live on where legacy doesn't exist, or if it does developers can see into the future and know what will be 'nonsense' in 10 y

What a fascinating planet you must live on where legacy doesn't exist, or if it does developers can see into the future and know what will be 'nonsense' in 10 years time, or make the whole thing moot because of course they rewrite their build framework for every release of the build system, having unlimited resources at hand. Must be nice there.