I'm gonna analyze the "why" of this guide from top to bottom as you see them in the website

Q:Where your playstyle focus on?
A:1)Being more than a R-W-E in teamfights
2)Can carry games

Q:Why 'Unflinching'?
A:Simple.You get CCed => you dead

Q:Why 1)'Transcendence' 2)'Waterwalking'?
A:1)Quick resets in teamfights make you usefull and carry
2)Teamfights take place mostly at river

Q:Why the 'Must' items in your build?
A:1)'Spellthief's Edge' to scale AP and Mana regeneration
2)First item-spike 'Staff of Flowing Water' for extra AP and AH
3)'Ionian Boots of Lucidity' for more AH
4)Second item-spike'Shurelya's Battlesong' for more MS and scales on AH

Q:Why all AP items for "TO CARRY THE TEAM" item section?
A:1)More AP=more heal,shield,passive and less damage for your team to do
2)More AH(that's what the build focus after all)

Q:No AH on the "HELPING A TEAMATE CARRY" item section?
A:1)Has 15 AH actually
2)The team carry a)one-shots so you don't have to press more than 2 buttons or b)has
sustain so you can play a engage ,play safe and go in after all abilities are up

Q:Why max Q first?
A:While not fighting is a good poke.Starting teamfight with more health than the
enemy(cause you poked him down)is a win.(right?)

Q:Why you champions who can cancel your W mid-air?
A:Are you really a Rakan main?

Q:Why should I trust you?
A:I really don't care.I'm Gold 4 after playing for 1 year. I have 140,000 pts on Rakan
right now.Don't really play some much ranked games tho.

Q:Are you inspired by something or someone?
A:Yes. That something is called 'Athene's Unholy Grail' or at least it was.RIP
The feeling of healing a ally half health with only 1 item just by doing R-W-Q-E
was the best. I miss it and I want it back. Nothing can replace it.That's the only
reason because I stopped playing Rakan in preseason till now when I came up with
this build.

I HOPE YOU TRY IT AT LEAST 1 TIME

GO EASY ON ME . FIRST GUIDE