I think the problem of collecting all properties in the left side of a tree can have different solution. I see that such properties are like global variables of the tree and it would be logically to remove them from tree space and put them into property panel of the tree. In this case you should not always navigate to those nodes but simply open property panel and change what ever property you want. The connection to tree property can be performed via TreePropertiesInput node. Or it can be done via drivers #NameOfProperty.
No nodes no problems.))
I had this proposal a year ago - Geometry Nodes - #25 by Random
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