IMHO, lowering can frequently improve the appearance of a vehicle.
However, in my limited experience, it always hardens the ride; sometimes improving the 'handling, often having the opposite effect.
Unless wheel arch clearances are maintained, especially under dynamic conditions, your tyres and bodywork could become very 'intimate'
For me? I use my van as a cruiser, not a hot rod, and value the ride as developed by Toyota.
A few of Alphards have electronically selectable suspension (HI TEMS) that alters the ride (not the ride height).
I have it on my machine MZ G Edition.
Two settings are available Comfort, and Sport
What is it like ?
Don't know, I never used it.
I have always had it set on Comfort.