By which I mean, don’t be too quick to give a weak civ a missing tech. Sure this is one way to fix the problem, but it also makes the civ more generic. And there are other, more interesting ways.
Good example is the Burgundians. They probably could use a buff, sure. But some people are asking for them to get Bloodlines. Don’t! There are so many other ways of making this civ more competitive, without making them more generic. Look to their unique strengths, and buff those. Bloodlines is not the only way, or even the best way. It’s just the most obvious one. And that’s rarely how you get an interesting game.