Indeed, I won't list them but I get at least 5 use cases popping into my head 
the moment I saw this, where one would want the intersection between 1 object 
and an invisible object 2: 

just one: solution to a puzzle could be invisible. as user moves tiles around 
the intersect would trigger "got it" for placement.   In fact I am using 
another algorithm for this very use case where we do stuff like store the loc 
of the hidden object then on mouse drag check the abs of the loc of the dragged 
vsibiel object   ….  and I'm thinking think, sheesh… I thinking I could be 
using intersect instead… 

is intersect expensive on mobile? Performant on Android? 

 BR

On 7/14/17, 1:11 AM, "use-livecode on behalf of Mark Waddingham via 
use-livecode" <use-livecode-boun...@lists.runrev.com on behalf of 
use-livecode@lists.runrev.com> wrote:

    As Lagi pointed out one can imagine that there are use-cases where you 
    want to know whether two things intersect regardless of whether they can 
    be seen (i.e. visible false, or blendLevel 100). Indeed, I don't recall 
    anyone ever commenting on this - so either it was too long ago and I 
    have since forgotten, or it is useful the way it currently is.

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