@Rakkis157 (and anyone else that enjoys this discussion)
I wasn't sure if the DP-era had the same first turn rules the entire time or not. For one thing, the DP-era comes in two pieces,
including its set prefixes:
Diamond & Pearl became the new "base set" for the era, having no prefix but becoming the prefix for latter sets: if you look at logos you'll see it isn't just
Mysterious Treasures for the next set but
Diamond & Pearl: Mysterious Treasures.
Of course we thankfully shorten that to
DP: Mysterious Treasures if we feel we need to include it at all, but it still helps identify where in the TCG's life span we are at.
DP: Stormfront is the last one in this line:
Platinum is the new "base set" and prefix that lasts until we hit
HeartGold & SoulSilver (or is it
HeartGold/SoulSilver?). In fact it is the BW-era and now probably the XY-era that are reverting to less distinct divisions in the sets, likely because there is no video game for them to make an easy, sensible break, not unlike the super-long EX-era (EX
sets, not Pokémon), though they really should have made
EX: Emerald just "
Emerald" and the new starting point.
Just to show this isn't all just a "me" thing, look at the contents of these sets: the big "tell" is their inclusion of Basic Energy cards. Every time we do have a new prefix, we get new printings Basic Energy cards. There are times when we get them and it is
not a set division, but a lot of those (like
EX: Emerald) have a feel like perhaps they should have been (though one or two seem almost random).
Wait... why did I go through all of this? Just to emphasize how the first turn rules
might have changed? No, that would be excessive even by my standard. Consider this an argument why at the very least such sets should be viewed as the places in the game we consider the... wow almost every phrase that works here, or at least that I can think of, has been used as a name or official term for something else. Hope you all can make your Confusion checks.
So for sure the official "breaks" in the set blocks, and likely most of the unofficial ones should be seen as the breakpoints or boundaries where we should look most for power creep. New mechanics
usually correspond with this as well.