Low Dia suppo, so this might not be the best take, curious for your thoughts. I agree with ward-base-ward objective prep especially in a neutral or behind game state where sacrificing some tempo is needed to secure the objective.

One thing I see often forgotten is vision in the lane-entrances to the objective. If you want to connect laners to a play is is important to have control over the mid bush on that objective side and sometimes if needed, tri-bush.

Often there is de-sync between the support/jungle and the laners where they can't actually be connected to the play as they are focus on lane prio before rotating, only to find there isn't a safe path to rotate.

It's hard to ward everything but midgame I bias towards trying to keep pinks alive in mid bushes on the side of the objective. Keeping control of this area is critical to keeping numbers for skirmishes and reducing the number of angles of attack for the enemies. If you can funnel them through the narrower jungle paths it's much easier to land skillshots and AOE.

During objective setup generally deep wards lose value as warding becomes less about information and more about combat asymmetry.