The build system can change with hardly any of the code changing. This is evident in how I've never even had to think about the build system at my SWE day job.

The build system can change with hardly any of the code changing. This is evident in how I've never even had to think about the build system at my SWE day job. It's evolved in the meantime. What's often impossible to replace without a full rewrite is a backend's DBMS, and people tend to underestimate how tight of a coupling that is. Only gets worse with abstraction.