The (unfixed?) problem w/ninja tabi on ADC is very similar to the old problem of abyssal on mids.
I.E., you buy it just to get lane priority because the damage tradeoff isn't significant (and you're also pretty much guaranteed to be in a matchup where the defensive stats are relevant).
I'm not actually sure the ninja tabi nerfs fix this, considering the only other options on AD are Mercs (rarely taken unless you're short range) and zerkers (attack speed is the worst offensive stat). It ESPECIALLY doesn't help that the purpose of tabis is to reduce AA DPS and the only thing zerkers does is increase AA DPS. I'm very worried that, as they're designed, if they're a good choice on tanks, then they're guaranteed to be a good choice on ADCs in lane too. = /
Maybe make tabis scale with bonus AR -- e.g., make it so the AA reduction increases 1% for every X bonus AR, and start the AA reduction lower? Give them a melee/ranged split on the AA damage reduction? Just spitballing here.
