I make reference here to boards that encourage an engine-type deck to built. I am not referring to Vineyard rushes (emptying Squires, Moats and Vineyards, say)
I recently looked at Mic Qsenoch's first match of Season 12. In the last game, I observed that he started buying the Vineyards in the middle of the game and then proceeded to increase their value.
This order of buying Vineyards is something that I have observed in some of my games as well. Sometimes, it is to prevent my opponent from having more than half the Vineyards. Other times, they are apparently so tempting that I begin to purchase them mid-game too.
This is contrary to buying most other Victory cards though (ignoring the early Island, say). The usual manner is to buy them on your last turns. Little to no deck-building goes on once you start buying green cards (ignoring Haggler gains, say).
Why is it that buying Vineyards follow a different rule (sometimes, at least)? Is this the correct thing to do in these situations?
I posted this here and not on Mic Qsenoch's video to possibly hear more ideas on this issue.