Pyramidology was a core teaching and cannot just be brushed over as inconsequential. It was used as the basis for Russell's 1914 teaching.
Actually, it was used to supplement the 1914 conclusion, not as its principal proof. The "Gentile Times" argument was the principal proof. Even that wasn't unique to Russell and Barbour. One can find it in Hatch, H. Grattan Guinness, and Elliott, and, though starting and ending at a different date, in Brown.
Pyramidology was subsidiary for Russell, not primary.
Was it right to teach it? No, of course not. Were Russell, Storrs, and Seiss worse than anyone else for doing it? Probably they were no more nonsensical than most. Should the Watch Tower have abandoned it sooner? Certainly. Only the worship of Russell kept it alive.
I'm not an apologist for pyrmidology or for Russell. My point is that these things have a historical context, and in that context they are less upsetting to me than they would otherwise be. For me the focus is on behaviour. Today's behaviour of elders and the governing body, to be precise. It's generally bad, untrained at least, and it hurts those who believe.