I’d say that investigation often is a useless subject. Investigation happens by itself as one goes deeper into feeling and gets comfortable feeling (being one’s feelings). Sometimes the thoughts just wanders of to things of importance.
When an great appreciation has been achieved of experiencing even the worst kind of feelings - then one is ready to question deeper aspects of oneself. Before that I think that one has a tendency to dig into nonsense like not ‘enjoying watching the television’ which only touches upon the surface of oneself.
This how I have come to look upon the subject of investigation after my own adventures.
An actually free person might know better @geoffrey @srinath