Why doesn't Photoshop have color styles? A style controls multiple objects.

But that does not give you what you asked for which was the flexibility similar to illustrator where you can change the colour of any object, anywhere in the layerstack, that is linked to a global colour.

Dave

Thank you very much.
This method is not very good.
Another method might be more flexible than this.
Layer>Insert Fill Layer>Solid Color and change the layer mode to “Filter Color”.

From what you guys are saying, it's logistically unlikely, but the  color has a fixed value and should be easy to implement.
It mostly depends, if Adobe wants to do it or not.

It should have been a PSD but with changes to cloud storage it hasn't worked that way.

I've sent you a PM with a link on WeTransfer. It should be valid for a couple of days

Dave

The example is a pdf?
It should be psd or tif.

@jane-e  Thanks Jane, I've changed the permissions - can you let me know if that was worked?

Dave

@davescm 

This is what I get when I click your link:

Jane

If you meant the example I gave above I've linked it here

Edit - Link removed see later post.

Dave

It feels a little complicated. Not very understandable.
Is there an example file?
Maybe we can only expect Adobe to be more advanced.

IMHO, this only makes sense for text, vectors, gradient fills, solid fills, etc., not for rasters.

It would not be straightforward to implement as it would require a set of swatches to be tagged as global (simple to do) and then any pixel made from those swatches, be they brushed on a layer, added with a blending option..etc, to be tagged back to that swatch. In a multi-layer document that would involve an awful lot of tags (1 per pixel affected) and would increase memory use considerably as well as slowing down the performance of brushes. (In short very hard to implement).
Finally it would require changes to the PSD/PSB format. In illustrator the swatches are saved in the AI document. In Photoshop they are not, hence the need to store them in the file format, and make them available in the swatch panel on opening, so that they could be adusted later. (Again very hard to implement in an existing, widely compatible, doc format).

Nothing is impossible, but the changes in structure and file formats, which would affect PSD/PSB readabilty in other Adobe and non-Adobe applications, make this far from simple, and the associated performance hit when brushing could be high.

Dave