Ask Raymott on the use of Past and Present Perfect, he's the expert. I think:
Past Perfect: I had puzzled. You are no longer puzzled, or you've given up puzzling.
Present Perfect: I have puzzled. You are still puzzled, or you have an answer or a possible answer.
I have seen the pyramids. 'see' can take an object, the thing seen, and is therefore experiential. 'be' 'exist' and many other verbs cannot have objects which are not their subjects, and are existential.
'He has pleased me' This contains no information about whether or not you remain pleased.
'He has pleased me, but now I dislike him.'
'He has pleased me and continues to do so.'
Student or Learner