That very well may be. As I haven’t done an in-depth look at it. But I was under the impression that you use AttachParent during the construction script and then during the construction, the engine code goes in and does all the needed AttachTo stuff in a much safer manner for construction as well as make sure it’s good to go when you make a blueprint class off of it and do all the editor-based stuff.
AttachTo() is definitely what you use during RunTime. But I believe AttachParent is for Construction.
But I could be wrong!