I noticed this as well.
My starting point with wealth topics was okay, hence I made good progress per time unit so far.
My starting point with romance topics was very low, hence why it takes a very long time for me to build momentum, despite having gone through many units of time here.
My starting point with spiritual stuff is far beyond most people, hence why I get instant results here, easily doubling it with every unit of time.
The personal starting point really matters.
It matters how many results one gets shortterm and also how much recon one has to go through first initially when starting out on the graph curve.
But what matters even more is to never give up and just continue the journey along the exponential graph. Even if you start at 0.05y or something like that with a certain topic, the key is to just keep going. Which is also the reason why there is the recommendation to stick with one particular title long term and ride it all the way through into exponential growth.