(bold not in original)
Please define what you mean by 'upgraded client'.
A client that supports Segwit after the activation occurs. Those clients can download and validate the data.
Yes, they can. And they must process more than 1MB of data in order to validate what they are calling a 1MB block. The difference in quantity of data, of course, being the amount of data in the signatures.
So tell me again why this does requirement for more data not lead to node centralization, when many SegWit boosters (perhaps not yourself - I can't keep track) rely upon '
increasing block size to 2MB will lead to node centralization' as one of their strongest arguments? Or at least as their
only argument for their claim that a simple block size increase is unsafe?