I... am starting to get it. I think. >.> The trick with N never registered as a major part of the deck to me, because something similar is done by pretty much any deck using N (if it will disrupt the opponent in a timely manner, do it even if you're hitting your own hand hard). My record against Seismitoad-EX decks is far worse than my general record, so maybe that is why the opponent using N when I've got a large hand seems more likely to make no difference or to backfire than to help?
Honestly, I know I this sounds off, but more opponents lost on the second strategy versus the first, because it was a far easier strategy to achieve. It only took one card, N. A lot of them however didn't know item lock was so easy to achieve. They were playing N because, well, that whats you do. N, in combination with seismitoad has a 33% chance that the opponent will dead draw on next turn. That is high, almost darn near as high as the shiftry deck stats. And not to get into it, but pokemon finds that stat acceptable, which I'm like you, I don't like the stat at all.
The energy disruption just makes it all the more irritating. But even without the energy disruption, because it is random, it does not make it the top two strategies of the deck. The strategy would come in third because it is random. N is what made seismitoad very consistent last year + the fact there were no draw pokemon. All the other stuff in my opinion was just icing on the cake.
In my opinion, I think Seismitoad EX was made carelessly. I think the game developers have since realized their mistake and are doing everything to rectify the problem. Killing a trainer is one thing, but nerfing a pokemon EX really throws kinks into production lines and economics of company. They probably had output contracts with printing presses and opted to solve it via game mechanics. In the future, for standard play, I can see the card diminishing over time via new pokemon/supporters. I don't think they want another year of a 100,000 quacking punch's.
All a larger hand does is increase your probability of drawing into a supporter or having the supporter when item locked.
I did ask my kiddo about Tierno and how he played it. He said he would ultra ball out for shaymin/hoopa, draw up 6, then tierno to take nine. He said it really helped with mega turbo. I did ask if he wanted try another card (birch), and he said no. I think Tierno worked for that deck at the time.