I sent it to the GGL team, but I imagine the feedback form would work just as well if not better.

I would suppose a flood of complaints would have some sort of impact.

To be fair, some work has been done on the new format, there is a bit that now displays TPs and an estimate of the byzantine calculation used to work out the new transparent system for allocating Avios to a booking. It's just much more cumbersome than the old method.