AI needs help - nobody questions that. I believe what
@BiteInTheMark meant is that there are mechanisms in place already that can be used / tweaked to provide more help if we deem necessary (and we do). Maybe instead of adding an entirely new mechanic that needs testing, balancing, adjustments, etc. we could reuse existing ones and just focus on balancing.
Example.
There is a parameter that says how much cheaper is building for an AI (AIConstructPercent or AICreatePercent) It is 90 for King, 80 for Emperor/Immortal and 70 for Deity. It basically says that AI gets a production bonus every time it creates a building (because it is cheaper). But that is not enough, there are events that add Production to cities. And we think AI needs more in later Eras.
So I say - why not make this parametr dynamic? Just lower it with every passing Era a little bit. This way AI will get more production bonuses with passing Eras.
E.g. iDifficulty * iEra / 3. Then on King you start with 90, and in Information you end up with 90-4*7/3=81. On Emperor, start with 80 - end up with 80-5*7/3=69. On Deity, start with 70, end up with 70-7*7/3=54. There are parameters for science and culture that can be treated the same way (ResearchPercent, PolicyPercent).
This approach treats all Civs the same, but at the same time promotes well-performing ones a bit - you get to next Era little faster, you trigger the bonus little earlier.