I didn't even mention whether I thought it was wanky, you pinned that on me. My position was it didn't really need to be explained why the foreheads changed. I was surprised bumpy Klingons were in Broken Bow. I used the term Klingon Forehead Arc because I have not seen those episodes, do not automatically know their titles, and it was the quickest way to refer to them.
Maybe I can afford to get the series collection next month, so I'll be more qualified to speak on the one series I've seen the least of.
Edit: Though it's now at $163 new at Amazon, higher than when I looked last week, so maybe not.