poudriere: create porttree of a partial clone of git

Hello.
As always, the inconsequential story provided by me :)

poudriere does a shallow clone when git porttree is created by poudriere ports -c.
In addition, a full clone of git porttree is created by adding -D.
One more thing, -B specifies the branch, but for example,

poudriere ports -c -p git -B "main --filter=blob:none" -D -m git+https

the option to make it partial clone can be injected well :)
(poudriere version is poudriere-3.4.1_1)

Should porttree of poudriere be a blobless partial clone?
What are the possible advantages and disadvantages?

Regards.