I don't think anyone has suggested there are more blown calls than before.
Technology does make the bad calls more obvious, that's a fact. And it makes people wonder why, if it can be done by technology, we don't eliminate the bad calls?
And the technological tabulations have confirmed things like the fact that Laz Diaz is one of the very worst at calling balls and strikes. Which makes people wonder why he was doing so in the ALCS.