[makomk]

More or less, except that the reason Bitcoin Cash happened is that SegWit seems almost certain to be activated at this point as a result of interesting political wranglings. The other subtle detail is that older nodes see a stripped version of SegWit blocks with the "witness" parts of the transactions removed, and it's this block that they apply the 1MB limit to. So while the signatures technically aren't part of a seperate block, they're not part of the main block either. This is why the non-witness part of transactions has to count as being more expensive.

[mikekchar]

Ah. I see! Thank you for that. It makes complete sense now. I was wondering why they had such a convoluted method for calculating the block size.