Coin feels like the only support item quest that finishes at a reasonable time without stomping lane

With Spellthief's I have to be constantly poking the shit out of the opposing laners which just isn't feasible in matchups where they can retaliate, and with Relic Shield I can't always hit it off cooldown without eating a ton of harass, which is exacerbated by the fact that its passive gold was gutted. Making matters worse, both items punish you super hard for not being in lane. Spellthief and Relic charges max out while roaming, while coin not only gives ms to help you roam faster, but seems to adopt Thresh's psuedorandom soul system that increases drop rate when you come into lane after being absent for a while.

End result often ends up with the support in the botlane that actually wins the matchup getting their support item wards 3-8 minutes before the other support, and just generally having signifcantly more gold even when the lane is relatively uneventful. Unless you buy coin, in which case you're basically guaranteed to finish it in 12 minutes at the latest.