I think it would be nice if every legacy paths had different challenges. Currently there's only one challenge per legacy path, which makes the game not only very streamlined but also favours certain leaders and civs. For example, as another user said, the Mongols have a hard time going from exploration to modern age because their previous objectives don't align well with modern age ones and makes it so that they're in a worse position at the start of the last age. I think the different challenges should be sufficiently diverse so as to make it difficult to get legacy points from more than one or two of them, but without making them completely exclusive.
#Different legacy path challenges
dapper cradle
graceful river
For reference, the Mongol feedback that was mentioned: https://discord.com/channels/1307104947426295818/1337333249395130409
More legacy paths would definitely help keep it unique. Fingers crossed, though I'm thinking that'll be expansion level stuff sadly