What is the point of B-D-I in a package that has no arch:any component?

Nilesh Patra <[email protected]>
Newsgroups gmane.linux.debian.devel.medical
Message-ID <[email protected]> 
Hi,

There has been a recent pre-MBF mail sent[1] to -devel and I saw that is has jaligner mentioned there.
I see in d/control that it vendors only one arch:all binary package (jaligner), and it has both Build-Depends and Build-Depends-Indep, and I'm confused why that is so?

What exactly is the point of having two separate fields in an arch:all package?
(Combining these into one would likely fix the bug as well)

[1]: https://lists.debian.org/debian-devel/2023/07/msg00188.html 

Best,
Nilesh
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