A while ago i realized in my play that this happens sometimes. Later when i watched other players stream i saw this happening, too.
I have 3 big examples of this:
1. The Power of Big Money
Almoast everyone went through the state of mind "Big Money is just OP" at the beginning of their dominion career.
As the skill and understanding of dominion mechanics evolves the power of engines if played right gets clear.
But i feel this often leads to a state where Big Money now gets underestimated. And a lot of good players will always go for the engine
when there seems to be one that can compete the best Big Money on that board. But it's not that rare that the best BM is just still slightly
stronger than that engine.
2. Thinning versus economy
The engine you want to build doesn't really like treasures and you want to get to the point where you cycle through your whole deck
as fast as possible. Trashing is often the best way to reach that goal. Newer players usually overvalue the addition of good cards to your deck in comparison
to trashing bad cards. Again i feel there is an observable effect of more experienced players starting to overvalue the trashing. Sometimes there is a tendency to
overtrash with chapel, sometimes it's about the question of upgrading/remaking copper over estate. I have realized situations where i chose to upgrade copper over
estate and the was actually considering buying a silver with the $3 left over on the same turn because there was no engne component at that cost. That is totally inconsistent because the deck has the same size now and an estate instead of a copper which is considerably worse. I see other people doing that aswell.
It's the same as with JoaT in engines that don't really want much silver. The early economy boost is just extremely important to get to those key engine components as fast as possible, much more important than this once additional "bad card" in your deck.
3. Triggering unwanted reshuffles / dead draw
When people start to build engines with sifting this is one of the most important lessons to learn. Triggering an unwanted reshuffle can
throw you back by so much! Maybe not as crucial but still pretty bad is terminal draw without more actions left in very action heavy deck at the wrong time.
You usually don't hurt your next turn as much but often you do hurt it and you also don't accomplish a lot for your current turn.
When people start getting better at dominion those mistakes will be made less and less. But again often it can get you at the point where you
don't really evaluate situations on their own and don't want to trigger an unwanted reshuffle even though you should have.
The same is true for dead draw. You built a Village-Smithy-Deck with treasure payload and get really unlucky colliding 3 Smithys at the top of the shuffle
without any of the villages? Don't be scared to draw Villages dead! Yes you will not make your current turn significantly better, but your next turns will be far worse than average anyway as almoast all of those smithies are already skipped and with that it is better to get to a new shuffle as fast as possible.
A connected example is in terminal draw Big Money where you already have a $10 hand with smithy at the top of the shuffle. You know your next turns will be worse than average so play this smithy even though you might now have a $13 hand with a lot of wasted money.