So, tried the normal maps for the ground textures and they look so much better in the sim compared with the ones they replaced. Sure would be nice to have the option to do that with the rest of the buildings, etc.... textures. Hope you all give it serious consideration.
I think the flat textures looks very bad and, since the problem with shimmering mostly happening at night with landing lights on, the most we'll do is to do a similar thing as we did for Basel, and have the Live Updater installing the flat GROUND textures only (those you could download from that link), if SSAA is not enabled in the sim, that's it.
Redoing the whole texture set and destroy the PBR, not an option.