If the block size was made substantially bigger, you'd begin to need very expensive equipment to be able to verify transactions yourself. Grandma is probably ab

If the block size was made substantially bigger, you'd begin to need very expensive equipment to be able to verify transactions yourself. Grandma is probably able to trust her grandchildren's nodes, but with bigger blocks her grandchildren wouldn't be able to afford a node and would have to trust someone else (who is rich) and the definition of the network would become more and more centralised amongst the richest as the size of the block chain grew exponentially faster than the £/HW is reducing.