Regarding “equally,” I think Paul is saying different members are not equal, insofar as they serve the Body in different ways.
Regarding “all,” I think Paul is writing about all the faithful, not all human beings, but how are we to know who may yet undergo conversion and be saved?
To humans, it seems that some members are inessential, but perhaps all have a place in God’s plan. Certainly all are beloved.
My thoughts exactly.
I would like to expand on your idea, slightly.
The whole body is good, but not all parts of the body are interchangeable, indiscriminately. Not all parts of the body belong together directly.
Some parts of the body ought to be restricted to indirect service of other body parts.
For a hand is wonderful when holding another hand or brushing off an itch from the skin.
However, the hand is not good when it’s finger tries to go inside an eye.
Each part of the body has it’s proper place, and it’s proper relationship to every other body part.
This variation is also true (albeit in an all or nothing way) to marriage. Marriage is where two bodies become one flesh. Some people go together, and some ought never marry. Incompatible people need an intermediary.
What many people don’t realize is that two people can both be good and incompatible.
Each of us has our proper way to relate to every other member of the body. We need to focus on relationships that build each other up.
The point I’m making is that equality, taken too far, leads to chaos and injury.
Some relationships are simply toxic. We ought to avoid toxic relationships.
