I was wondering if there is any science-based research consensus which recommends using nonsaturated colors (pure shades of greys and blacks) in complex graphic design software for better usability? For example Photoshop, 3dsmax, Framer. I understand that darker interfaces are better and well researched and that saturation "removes" black from the color, but what if you still have a great contrast but with some tint?
The examples you have are doing two different things: configuration vs consumption.
I don't have any scientific research off hand, but your examples are doing two very different things.
The first example you have is document-centric, where the users content is the most important thing. The interface is a tool.
Gray or black backgrounds recede or encase the content in a neutral manner, allowing the user to create, edit and assess the document (or film, pic, etc) they are manipulating free from color interference (which can be undue attention/visual seduction) from the application.
The second example is for consumption, where the goal is emotional engagement, novelty, brand promotion and promoting the content itself. This is the realm of seductive and engaging style, and color can play an important role.
This is a rabbit hole, but there's a great paper by Brett Victor re: these two types of software/apps.