> Especially because Clean Code doesn’t actually seem easier to read or indeed maintain
If that is true, then there is indeed no point in applying Clean Code. But I disagree with GP that Clean Code leads automatically to bad performing code. That depends on your language and execution environment. A JVM is very good at effectively removing vtable indirection if they are not needed at runtime.
There's also other issues with this paradigm, like creating objects out of the arguments to a function. That not only makes your code less maintainable (what if you need a subset of the variables), but now you'll have to drag all that data to each function you create.
Clean code is, IMO, worthless, data- and domain-driven design practices accomplish the goals of clean code better than it the paradigm itself does, and also improve other considerations like correctness and performance.
An interesting question, but a SoA isn't necessarily better than an AoS: it depends on the access pattern, so the question is whether this optimisation could be added as a part of PGO..