It looks like newer versions of Bambu Studio may already handle this in some situations, especially when there is a large flat supported area. However, it would be helpful if this behaviour could be applied more consistently, because some of my prints still have difficult support removal when using tree supports.
A while ago, I noticed that when using Bambu support interface material, normal supports separated much more easily and cleanly than tree supports. After comparing them, I realized the likely reason: with normal supports, the support interface usually extends beyond the edge of the surface being supported, while with tree supports, the interface stops exactly at the edge of the supported surface.
I tested this several months ago by comparing two prints that used tree supports with Bambu support interface material. In the first print, I used the default tree support setup, where the interface layer automatically stops when the supported surface ends. In the second print, I manually created my own support interface layer and extended it beyond the edges of the supported area.
The default tree support setup caused the interface material to become embedded in the supported part. My conclusion is that this happens because the transition between walls and infill in the support interface lines up with the same transition in the printed part. When those transitions are aligned, the surface lines can interlock with each other, making the interface difficult to remove.
When I extended the support interface beyond the edge of the supported area, those wall-to-infill transitions no longer aligned. As a result, the support interface came off cleanly, left a smoother underside, and did not become stuck to the part.
It would be very useful if Bambu Studio could extend tree support interface layers slightly beyond the supported surface by default, or at least provide a setting to control this offset. This could make tree supports much easier to remove when using support interface material, while also improving the surface quality of the supported part.