So, There is a bit of difference between Actor Components and Scene Components.
Scene Components are the ones that have access to transforms good example of this is Static Mesh Component you can attach that to an Actor.
And Others are Actor Components if you look at UE4 hierarchy you will see Actor Component is the parent of Scene Component. These don’t have access to AttachToActor or AttachToComponent functionality. The best example I can think of these is look at Character Movement Component In the Character Class.