Regarding the Grail.
I think it could be allowed to start digging for it from the first week, with this change:
- The cross on the map appears only after the entire map has been revealed, in any location on the map, and not strictly in the center.
This will minimize randomness and delay the Grail rush on small maps, and on large maps, it will eliminate the guessing game. For example, two obelisks are revealed, but with clear distinguishing features; the player sends a couple of heroes to the center of the presumed area and digs up the desired object in a few days - this is not ideal, in my opinion.
If it is technically feasible, I would be all for it.
In my opinion, the Grail is a classic element, and it shouldn't be nerfed.