Yes, I might sound silly as well, but I was thinking when talking about working with Blender that 10-bit colour depth is someone’s requirements number one. How about considering to give it a try to Radeon™ Pro W5500 or Pro W5700 graphics cards?
Those are not today on AMD Radeon™ ProRender for Blender® compatible Linux® AMD Graphics Hardware list (ready yet for Linux platform), but tomorrow that might change. Radeon Pro Software link is here. And yes, I understand this post is in wrong thread (not PureOS compatible) as it might be hard to support 10-bit (each of red, green, and blue) colour depth without non-free repository. Anyway, I was guessing and now see clearly that for @reC panel 10-bit support (1.07 billion display colors), for graphics intensive workload, is important and he is not alone, for sure. And perhaps in ten years from now on my eyes will not be able to make difference in number of colours but today I’ll not watch single Blender movie in 8-bit colour, just because I can afford this to myself (without judging those that cannot or rather spending their money somewhere else).