You're conveniently forgetting the fact that almost NO ONE BOUGHT THE ITEM for the next 2 years until RIOT decided their item to help melee fighters compete with ranged, and survive CC in teamfights should be instead buffed up so ranged ADCs could abuse it instead, just like they've done with BotRK several times, as well as Sterak's Gauge, Maw of Malmortious (which still can't stack with SG like originally intended due to RADC abuse) BC in several of its iterations, Ghost Blade even, and who could forget the on-hit ADCs abusing Guinsoo's and it being remade for them, or Death's Dance being retooled for them, I mean seriously, the list goes on, and on and on, and oh hey, did you forget about GA recently?
Back to MS, it wasn't used, was purchased less than Zephyr, that is, until RIOT makes it a ranged ADC item instead:
"V4.10
Combine cost increased to Gold 700 from Gold 600.
Total cost increased to Gold 3800 from Gold 3700.
***AD increased to 80 from 60.***
*Movement speed on active now also applies to ****ranged**** champions.* "
Where they dropped the part where ranged couldn't abuse it (as it was originally designed to help out MELEE fighters and MADCs (now Skirmishers) actually compete despite the limitations of being melee, thus in range of more CC and AoE magic damage, hence why it also gave them some lifesteal so they could survive there, but not enough AD to be worth getting on say, a ranged ADC over another pure damage item. They then increased the attack damage by a whopping 33% for a measly 100g increase (note, 20AD is worth 700g, so it was 1/7th the price it should be, on top of also removing the ranged penalty) so that ADCs would actually not have to sacrifice damage, nor utility on the item, but get their cleanse, magic resist, lifesteal, extra movement speed, AND A FULL ITEMS WORTH OF AD, from what was designed to be an item to equalize the ranged differential and help melee ADs compete with ranged.
So uh, what was that bullshit you were trying to say about "You try to run with this onesided [sic] narrative that. . ." you clearly biased ranged cancer player?