Why do we wait so many weeks untill Behar Bechukosai, when we could have caught up with Eretz Yisrael this week?
I was thinking the same question.
Note that the order of the parshios was really made for outside Israel, and was only introduced into Israel later. It is therefore not up to Chutz La-Aretz to find a double parsha to put together, but for Israel to find a double parsha to split up and to “slow down.”
It is apparently preferable to split up Behar and Bechukosai than to split up, say, Tazari and Metzorah or Acharei Mos and Kedoshim, perhaps because of the connection between the content of the respective parshios.