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It's a relic of the past per-character system and has no more reason to be this way. This needs to be changed.
Correct.
The same should then apply to the Sulphite gain when you open a map with sulphite scarab but actually run it/click it with another.
right?
Yes, that should already work afaik.
What about looting delves? Previous leagues if the character starting the delve wasn't there no loot would spawn. Example being, if my main character died during a delve and i still wanted the loot I could swap toons to still get the loot on the floor but, clicking chests nothing would spawn. Will this be changed or am i reaching to far?
It is possible to change characters for Delve, but you are not allowed to die.