If Early Game is the weakness of marksmen, why don't more of them take Inspiration?
From what I can tell, the majority of the Inspiration runes function to smooth out the early game, offering you things like free boots, free potions, extra waveclear, more gold through debt, etc. The tree seems to be geared towards giving you more gold, and ADCs love gold.
However, with the exception of Ezreal and his Kleptomancy shenanigans, very few marksmen actually build Inspiration, even secondary. The dominant builds all involve some combination of Precision, Domination, and Sorcery.
What's worse, there's very little variety within those trees for marksman. They generally go for Triumph, Alacrity/Bloodline, and Coup de Grace. Sorcery is usually taken secondary for Absolute Focus and Gathering Storm, and Domination is usually taken for the sustain of Taste of Blood and Ravenous Hunter, or the extra AD from Eyeball Collection.
I'm just curious why a rune tree with all sorts of options that give you more gold and make your early game easier is not popular with the class that scales the hardest with gold and has the hardest early game. Sure, Inspiration gives you no damage, but it gives you so many other things that help empower your early game, let you stay in lane longer, and spend less gold on things that aren't your core items.