This is the very reason tiles are more messy. Icons are all exactly the same size, or rather they take up the same amount of space. I used Windows phones back in the day, but I never liked the UI. I think it's messy. I see screenshots of people's Windows phones' home screens, or after they're finished setting up their Android phones with Launcher10 or something, exclaiming about how beautiful it is, and I'm here thinking "Ughh, yuk!"
Either way, it's pretty much a non issue now. Windows phones are gone, and Live Tiles on desktop are almost gone. We've come full circle, and we're back to icons on the desktop. Evidently it's what the customers wanted, or it's what the OS designers wanted. We can talk wistfully about Live Tiles, but it's history.