So Meddler said Koggy is the sustained damage centerpiece ADC
As opposed to Trist, who is the tower-eating option or Miss Fortune who is the AoE Wombo option.
Problem is, Koggy is only able to do his sustained damage for six seconds at a time on a 7 second cooldown. During this time, he's effectively rooted (unless he wants to lose a large chunk of his damage) and utterly unable to do anything about his target disengaging from him. When his W is on cooldown, his options are to use his mana-devouring Ult to snipe at low HP targets, move into basic attack range to proc his Innate, or cower behind his team whilst being utterly useless.
Of all the various ADCs, Koggy's fallback play pattern is probably the weakest.
So if Kog is supposed to be the immobile sustained damage threat in the ADC lineup, why not actually make him one?
Lowest impact change, Koggy's W could have its duration increased by 6 seconds every time he scores a takedown. This would have no real buff to his early game, but it would improve his ability to gnaw through team-fight targets much more reliably.
His W could be turned into a toggle that consumes ~5 mana per second. That would allow him to keep up the pressure, barring burning through his mana pool with his Ult and his obscenely expensive E (seriously, that thing costs more mana than many Ults).
Or if Riot wanted to get really creative, they could move his W to his Innate (yes, the whole thing. Graves set the precedent here) and give him a totally new W.
Either way, Koggy would be able to keep up the sustained damage and actually do the things Riot apparently wants him to do.
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all run rampant. Because they have better early games and late games. Kog already lacked an early game, slightly buffing his base value while completely removing its scaling (which was somewhere up to 8% if stacking all AD and no AS or crit). On average a Kog would get about 6% max hp dmg around end game as magic damage as AD not building magic pen. Meaning if you have 100+ MR he is going to be doing maybe 3% + 6% current from BotRK. Now he gets a a max of 1% + 4-6% late game without building magic pen. That is a huge nerf to DPS and considering it's kind of bad to stack AS and crit and low damage. This leads to you killing everyone equal speeds instead of killing the carries then whittling down the tanks. On top of this he still has almost 0 self peel.
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which no longer gives AP scalings. Much like why Jax has AP scaling.
being op not that is wasn't a thing before.
does a better job at sustained dmg