I think one of the founders comes from Storm Yachts, a Dutch venture which debuted in around 2013. With some interesting projects.
They where sub-contracting builds around Holland and Poland of what I heard, but the yard went belly.
In around 2015-16 they used to fill social media with adverts at some point, but they sort of vanished from the radar around 2017.
Storm Yachts was a growing success so I was surprised when they sort of vanished from the map.
I think they sold the projects to Holtermann and now improved them for today. PowerYacht Mag Global Informative Motor Yacht Page
The X-treme 58 is the Storm 53 redesigned.
As for having double systems you can have those on many production yachts, think is people with moderate to little long cruising experience will not bother.
Only those with experience will thick the optional box. Even as having a double water pump for example....