Ah yes..... Our "whole-house" RCD is another angle I would like to see addressed. In rural areas such as where I live, TT is still by far the most common system (I'd say about half the houses in my small settlement are still on voltage-operated ELCBs), so split-load units aren't that common.
I'd like to see the wider adoption of TN-C-S (PME), and a move toward the American idea of individual branch GFIs, in place of just one or two main RCDs.