Italian built vs Dutch built superyachts

Your own logic seems right. Or at least close to mine. Italian boat makes sense to buy slightly used: you get a discount for having someone iron out all the child's maladys in it. Dutch boat, less so: you pay almost full price of a custom to get it in a form customized to someone else;s tastes.

But it's very generic view and exceptions are surely many.

Among the biggest reasons people go for refit of almost-new (<5yrs) boats is that new construction times at busy wharfs are really long, 2yr wait is, like, normal. Many new owners want their boat "now" so go for refit as a faster option, often aware of additional expense (e.g. Reliable, Fast, as above).
Same logic as someone could buy a Ferrari Enzo (limited run, long waits, if someone doesn't know) "used for a month" for notably more then factory price

Another case is when you manage to snatch a genuinely underpriced boat which makes the whole refit story really worth it. By far not guaranteed tho.

(And there are also "refits" in name only, more accurately a new build using some recycled metal from old boat But those are entirely different topic)

San Lorenzo changed ownership a few years back. That's what the incongruence is about between that unfortunate launch years back and the positive recent feedback.

I don't recall when the change happened. Sorry. 4 to 8 years ago ?.