I just don't see the reason I should pick Rakan over other supports.

Sure I have not really got to play him yet, but when I look at his kit and when I see him in my games I kinda get the feeling he's outclassed, save for his survivability and his ultimate.

As a support you mainly want to do two things: save allies and engage/disengage with cc. The first thing is pretty simple with most caster-supports. Your adc in trouble? Slap your shield and heals spell on them for instant effect mostly. For Rakan to do that with his full power he needs to a) hit his Q and b) also come really close to you. Every half second this takes longer than an instant effect increases the risk of your teammates dying. So obviously people gonna prefer the more reliable option.

The other aspect is cc. And even here supports like Nami or Janna have some serious power. Especially Nami who also has massive AoE potential in her ult (if it doesnt get instantly deleted by ONE FREAKING WINDWALL PIXEL), but when I compare Rakan's jump to Nami's bubble... the bubble is also delayed, also counts as a knockup, but it doesnt put me as the user in danger.

Combine that with the fact that saving people as Nami is a lot easier, and that she still has her E to work with, and I somehow see no reason to pick Rakan over Nami, who kinda does the same thing he does (healing, cc that favours getting the enemy away from your adc), but more reliable and with higher versatility.

So overall I am not sure why I would want to pick him...