Luden's echo, new passive idea?/+ idea for team builder

I came all the way from Europe to post here in hopes of getting more visibility currently passive is pretty underpowered and there's always a better alternative than building it, I'm not gonna do the math, but it's been calculated on inven, here is a video about it, the dude in the video is imls ex coach SUPA HOT CREW, MYM, Roar and currently coach of Team Gravity, he knows what he's talking about. Now in my opinion without doing math here's my rough idea: is supposed to fill the slot of a 120 ap item by the name of dfg; the problem was that dfg was able to negate all the tanky stats from tanky items built on certain champions so dfg was taken out and le was created with the goals of filling the 120 ap item slot and with a passive similar to except that statikk is an underpoweder item right now because of the crit nerfs but in my opinion it's still a better passive if you try to compare them because can crit multiple times with that passive. So why not change passive: remove the statikk shiv style and give it something like at 100 stacks the next damage dealing ability to deal 50% more dmg or 100% more dmg (its a concept didn't do the math) that would make more sense because it's a real damage dealing passive like the item is supposed to fill in for while not negating all of a tanky champion's stats, and sure, one will say LeBlanc but she can 1 shot you without such an item too. Alternatively the passive on le could be buffed, that could also work but in it's current state its really underpowered.

On another note: idea about team builder- since when you click join a team you are presented with the most needed roles captains are looking for so if you don't want to wait you can play a needed role, why not make the same thing for creating or joining a team, I mean it happened that I waited 20 minutes in queue and when I decided to create a team and look for 4 other people it was pretty fast because there was a demand for team captains and viceversa.

thanks you for reading.

tl;dr is underpowered, giving it more damage/ another passive that gives you something like deal 50% or 100% more dmg when casting a damage dealing spell will fix this / team builder could use a notification telling people if they should build a team or join a team depending if captains are needed or not.