There's an interesting thread below titled A4 Device Poll. It's a short thread and I disable the poll site years ago. However, from reading the thread it was about ten years ago that A4 devices were starting to talk hold. What I can't believe is that the major A3 manufacturers have continued to lower prices on the A3 boxes and move very slowly with offering full functionality for A4 devices. It's been ten years!
Enjoy the threads from ten years ago this week.