This is a difficult one.
I understand the old school, but i also appreciate the younger end. Power-point is good tool for the diagrams and graphics that possibly not all of us can draw properly, this must be backed up by the "knowledge" that we hope we possess as FI's to be able to answer questions that our students may ask.
We also have to appreciate that not all instructors like writing on white boards any more.. we ALL have to move with the times.
And before i get a load of flak, i speak from experience of a very recent CAA inspection that was carried out at my ATO where i did a PFB on a nominated lesson, i had old and new methods ready to go, i chose power-point for this particular briefing and it was received with a breath of fresh air by all..
Me, personally i think, adapt..overcome..succeed..