It's true that raising a Series A is always difficult, but it's also true that there are far more seed dollars available than ever before. It seems to me like this has to cause some sort of shock to the ecosystem, even if the total volume of Series A dollars hasn't decreased.
I think this is the flip side of 'easy seed money', which is to say smaller investments are made more liberally so the percentage of them that pass muster at Series A are inversely proportional to the amount of 'lenience' they saw in the seed round.