The bubble is probably just something that can be replaced as intended. It looks a bit annoying in that it's obscuring a lot of area, but if you want to simulate that it's harder to target faraway stuff, that would be exactly what one wants.
The bubble actually obscures less than the old cross did… it’s just visually it looks a bit larger but now you can see completely through most of it. It can also be increased in size to “lasso” points of interest, etc… Or expand it into a capsule to show a name. Also eventually the border of the bubble will be used to indicate different effects whether temperature, magic detection, whatever.
It also has another side effect in that with the cross-shaped crosshair you think “pixel level clicking” which doesn’t always work for a variety of reasons but with the bubble you have to center it more over what you are pointing at.
I'm a bit sceptical about the selection menu. A deeply nested hierarchy with hidden subchoices makes it harder to navigate quickly.
Though I'll concede every day that making selections gets surprisingly hard as the number of choices goes up. It's possible that one can't do better.
There are over 400 block types now and climbing. Yet with the menu I’m able to get it to the point where nothing is ever more than a few clicks away. I think the deepest menu is four levels but most of the complicated block sets are not more than three deep. And each level (except flora) has no more than four or five branches at any level.
The tree also lets me eventually eliminate certain subbranches based on tools or skills acquired.
Anyway, this particular wand is probably just for “creative mode”. “Real game” building will probably be a bit different as I may require full blocks to be placed and then “carved away” to make other shapes.