The interview didn't go into currency drop rate

They did sort of mention that currency drop rate and needing currency to juice up waystones as well as for gear etc., but apparently neither the two streamers nor GGG think there is a problem with the drop rate.

And almost all the discussion was focused on the endgame, no mention about the horrible currency drop rates during the campaign.

Quite sad. But I guess it was to be expected, as the streamers themselves seem to be POE1 veterans, so they probably don't even think campaign experience is worth any discussion, and they probably never had any trouble since they would have hoarded their currencies for the endgame and knew exactly how to maximize those currencies.

Also nothing was mentioned of SSF. I guess SSF just isn't big in this game so nobody thought of asking any questions about it.

Mark pretty much said (not with these words) you should just play the current broken toy with MF and that's intended.