The first is your nostalgia goggles. You are most likely far better at games now, then you were when you were 10. This will lead to the perception that builds you do now are more powerful than builds back then.
The second is op interactions or combos. Suppose that in a given game there are certain percent of op interactions, say 10%, or 5%, 1%. The specific number doesn't really matter. As a game's lifetime goes on, the number of possible interactions for two effects increases as the number of effects squared. Similarly the number of possible interactions for three effects goes as the number of interactions cubed. Thus if there are only the three archetypes with say five abilities each then there are 225 two ability interactions and 3375 three ability interactions. Now when we increase the number of classes to 10, there are then 22500 two ability interactions, and 3.3 million three ability interactions.
This leads to a situation where you will more rarely get a setup with an op interaction using just the three archetypes, compared to when you mix in one or more of the more exotic classes.
There are two things you are missing here.
The first is your nostalgia goggles. You are most likely far better at games now, then you were when you were 10. This will lead to the perception that builds you do now are more powerful than builds back then.
The second is op interactions or combos. Suppose that in a given game there are certain percent of op interactions, say 10%, or 5%, 1%. The specific number doesn't really matter. As a game's lifetime goes on, the number of possible interactions for two effects increases as the number of effects squared. Similarly the number of possible interactions for three effects goes as the number of interactions cubed. Thus if there are only the three archetypes with say five abilities each then there are 225 two ability interactions and 3375 three ability interactions. Now when we increase the number of classes to 10, there are then 22500 two ability interactions, and 3.3 million three ability interactions.
This leads to a situation where you will more rarely get a setup with an op interaction using just the three archetypes, compared to when you mix in one or more of the more exotic classes.
It's just math.