'Set Mission Objectives' is scattered all over redundantly and mixed in with totally unrelated triggers in all the versions of SCW I have.
Wondering if they serve some special purpose for the function of the map?
Or is it just a way to help keep original creator credits included since SCW seems to be an open to public project?

It seems to me that the map might have different Mission Objectives for a sort of "directions" on what to do at a given time in the game. Are they all the same?

They are all the same. It's not an rpg or campaign. There's no logical reason for it other than maker credit as far as I can tell. But there are always some new quirk or trick I don't know about, and that map is tricky in it's functions. I know Nuderaider worked on fate6 & Dark2 versions of SCW so hoping he might shed some light on this.

I also don't KNOW why LegacyWeapon spread these Mission Objectives across multiple triggers but I suppose he wanted to keep the credits in. I just didn't care and changed the string directly in ScmDraft 2.

Btw. I didn't make those ridicilous L6 versions (x10 heros, stacked money ccs).
I made the L5 series (many versions, steadily improving)
and some day I wanted something new and made the DARK series (then DARK²) now I've released the DARK² v1.2 beta. where you can create multispawns (create 1 spawn which spawns 5 or 10 units).