This order of watching Star Wars refocuses the story onto Obi-Wan Kenobi, relying on Ewan McGregor's performance to carry your enjoyment through the prequels. Ol' Ben is a big part of "A New Hope", and flashing back to his journey after Luke destroys the Death Star shows us how he became the wise old man we met on the sands of Tatooine. Instead of a standard hero's journey from nobody to champion, Star Wars becomes a tale of an established hero passing the torch.
Fingers crossed for plot twist reveals in "The Last Jedi"!
The same can go for "Rogue One" and "Solo" as said in previous orders: both can be watched before Episode IV, as that's when they take place, but it would ruin the start of the whole purpose of this order, so their listed at the end of the whole Episode order to give context to how it all started in the first place. Similarly to another order though, they can also be watched after Episode VI and before Episode VII. Additionally, they could be cut entirely from this order as well.