Ok so how do you keep talking about what is destructive to the milky way and how stories are made if you are not up to the lore? the "fake" sciency stuff is part of the lore. You can't just throw it away and keep the rest. Its part of the universe created. Its why people are mad about the crucible, the space-magic. This is science fiction, you have to pay attention to the fake science, its part of the setting and tells quite a lot about it.
Just because I didn't know about one bit of minutia (that the engines have to be purged every 5 years into a planet), doesn't mean I'm not up on the lore...
And you don't need to know every bit of the lore to understand the endings.
Refuse: reapers "reap" all sentient life that is close to space faring or is space faring.
Control: Shepard merges and takes control of the reapers and is super robot police.
Synthesis: all organic life becomes part synthetic, and vice versa. Including the reapers and husks.
Destroy: all the reapers are dead. All synthetic life is destroyed, or not depending on EMS levels.
Those endings are mutually exclusive.
Attempting to modify them or combine them or ignore them is destroying player choice.