legacy points

I really hate this mechanic in this game. Basically, what the modern age cultural legacy boils down to is spamming archaeologists and mass excavating tiles before everyone else does. I also noticed that my military units cannot kill them working on MY tiles. What the hell? Or is this a bug...

In three playthroughs of Civilization VII on Xbox, I was consistently prevented from using my legacy points when transitioning from the Age of Antiquity to the Age of Exploration, except to select a Dark Age or change my capital in two of my three playthroughs. In the last playthrough, with...