There are two things about GA4's design could've stood a bit more refinement.
The first is the ability to drag and drop audio files onto the pads from anywhere outside of Cubase. You can already drag and drop audio files from outside Cubase onto a audio Track. So why not skip that extra step (drag audio to Cubase > Drag audio part from Cubase to GA pad) and simply drag any audio file, from anywhere, directly onto a GA pad? (GA's predecessor, the LM-4II, was able to do this).
The second is why the designers persisted with what I consider to be the limited MPC-like 16 pad paradigm. This is a design originally forced by the production cost/real estate restrictions of physical hardware. GA4 is a software GUI….something that could easily be be made to dynamically resize to accommodate up to 128 pads at once, unrestricted by the 80's synth "banking" mentality.
I'd take the convenience of monitoring and pad selection in one go, over nostalgia, any day.
That said, even without these additons, this is still an excellent improvement over its predecessor.