Nice and clean contradictions. EQ is not the most spammable move just because it has 100 BP. It has many Pokemon that are immune to it and generally has worse coverage relative to our specific metagame than EQ does outside of Aegislash. Moves like Close Combat or Fire Punch generally have better coverage by hitting more things than EQ does. Examples include Skarmory, Rotom-W, Ferrothorn, Scizor, etc. Not to mention Close Combat has 20 more BP than EQ and generally the drop in defenses won't matter to an offensive Pokemon. THAT is why Aegislash centralizes the metagame around EQ. Anything that doesn't get STAB from it would most likely not use it if it weren't for Aegislash. It's not like Gen V where Jirachi and Rain made EQ a more viable option.