Err, but it's still a diffusion map. Albedo is the base color input (definition), commonly known as a diffuse map. For example, if you are using metalness, the albedo is usually defining the diffusion of non-metal surfaces of the material. Even in PBR it's still commonly referred to as a diffusion/albedo map. Even substance on a coding level is calling it "Diffuse". The only reason it's really "Base Color" is because it's a drag-drop layer colouring system, and it's the base one.
And again, the slider is actually doing a diffusion effect, lightening or darkening the map inserted, which is inherently diffusion. It's not doing any "Base Colour" anything. It's diffusing, and the Base Colour Image/Function defined below it. Similar to C4D. You have your Colour, you define with a map/tone, and then the diffuse, which is the lightening darkening of the base color you picked whether via certain areas (masked) or the whole map.
Is this just to be familiar to substance designer users really? And if you're naming it based on an invisible aspect of the metalness function (which is hardly encompassing PBR and really actually a rare material over the natural ones), don't you think that's weird? Especially when in normal circumstances it is just a diffusion slider?
Maybe I'm just getting tired of arbitrarily renaming stuff in the framework, or weird changes. Like now the scientific notation system is double-digit instead of triple which doesn't appear to have been for any real reason. If you're going that far why not single digit; ie 1e+6