The thing is that, if you have the mana, then options like Faiths Reward or redundancies for Rootborn Defenses such as Make a Stand and Unbreakable Formation, which he mentions, become viable
It can also hit planeswalkers, and can do it all for as little as one Red mana, if you have some equipment
This card is useful at different points of the game which is always a plus when including it in your deck
If you control a creature with just 3 toughness like Arboreal Grazer, youll accelerate your mana base quite quickly
Wraths just aren't good against Vehicles, and Dusk // Dawn doesn't really help against Four-Color Copy Cat either, so unless Amonkhet (or bannings) brings about significant changes to the metagame, Dusk // Dawn might have to wait a while to have a chance to shine