This was probably a "lazy refresh" because Apple could be unlikely to make another one. Maybe an excuse to cut it out of their product lineup and get people to switch to Apple-silicon, Apple will say this product performed poorly in sales so people are no longer interested in this design, and ignore its actual shortfalls like the fact there is no GPU support, and no upgradeability or real modularity. This could just be Apple's way of saying they completed the transition and allow them to stop software support earlier on older intel Macs.