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I have a mesh with a single edge/two vertices, which I've added a point instance geometry node instancing the "circle" mesh.

enter image description here

What's the most practical way to change the amount of circles being instanced? Let's say I wanted to animate that there's 2 circles, then 3, then 4, then 5...

Using the subdivision surface node doesn't work because it doesn't just add single points, but subdivides the generated edges.

Using point distribute just doesn't work... unless I'm doing something wrong, it seems to only work on faces, not single edges.

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you can use this setup:

enter image description here

and keyframe the count, then you will get:

https://youtu.be/8Ftlse3fn2Y

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Similar to Chris' answer, if you use Line set to End Points, objects will be instanced between the start and end points, rather than extend in the direction set in Offset.

enter image description here

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