You are right, there is a fine balance between just enough variety to be able to achieve your vision without leaving Minecraft-style jagged edges and too much v

You are right, there is a fine balance between just enough variety to be able to achieve your vision without leaving Minecraft-style jagged edges and too much variety and specialisation so that you cannot build anything novel at all. But we also live in a time where you can easily buy boxloads of generic Lego bricks second-hand (some of it probably 20 or more years old) for almost nothing at yard sales or on a local buy-and-sell website. Lego bricks are good for 2 or 3 generations of children.