We originally discontinued definition builders in the 6 UI Framework, because in M5 they've historically been left out-of-sync and unmaintained, and because generating them from our complex hierarchy of definition classes and interfaces was not possible.

Since then, Lombok's experimental @SuperBuilder may come in handy, and in fact is already the subject of PR #2048 from beschle.

Let's move forward with this, tentatively noting it as an experimental feature as well (if not in code, at least in docu).