That's not really a valid comparison. The problem with Super Strength on Scrappers is really related to Rage. The set as a whole is balanced around the idea that you have an 80% damage buff up pretty much all of the time. The problem is that an 80% damage buff is a lot more powerful on a Scrapper than it is on a Brute or a Tanker since Scrappers have much higher damage modifiers. Functionally speaking an 80% damage buff for a Scrapper is more like a 120% damage buff for a Tanker or Brute.
So at an absolute minimum if you ported Super Strength to Scrappers Rage would need to be nerfed to about 50% damage boost to keep the damage output in line with Brutes. Even then you might find it a bit to powerful due to Critical Strikes.
Would have to be just a hair higher to be equal to Brutes. Normally at 50% fury Brutes and Scrappers will do equal damage outside of crits.
Scrapper Attack: 150, slotted w/ 100% damage 300. Add 50% rage 375. Double rage 450
Brute Attack: 100, slotted w/ 100% damage 200. At 50% fury 300. Add 80% rage 380. Double rage 460
50% would put them below this threshold but 53% would put them equal. Another thing to consider when comparing the 2 ATs is that Scrappers for most sets have a higher damage buff with Build Up and similar powers vs Brutes. So during that 10 seconds with 100% slotting for damage, instead of 300 they would do 450 but a brute instead of 300 would only do 380. So for all other sets, the scrapper does slightly more damage over time. At base recharge this means around 55% on Rage would make the difference between a SS Scrapper and SS Brute about the same as any other set.
Then that brings us to another issue. When you compare 2 identical sets and have the brute at 50% fury and exclude crits, the Scrapper version and the Brute version are exactly the same.
Over time including crits, they are the same at 65% fury. Where things change is with Build Up combined with recharge. The more often build up is used, the farther the scrapper pulls ahead with the exact same attack chain. If you have Rage nerfed to 55% then a high recharge SS scrapper would be roughly the same as a high recharge SS brute where every other set, the scrapper pulls further ahead with more recharge.
So if they were to port SS to scrappers they have several things to consider. If they nerf the Rage percentage too low then SS will suck on Scrappers and all the work that was done will be futile as almost no one would play the set. If they leave it too high, then it becomes super popular and everyone is running around with SS/Bio Scrappers stomping everything to death and popping Parasitic Aura right before rage crashes. (Don't pretend this isn't why we want SS on Scrappers) Finding a fair middle ground would take a lot of work and I would not expect that of people who are bringing the game to us without getting paid for it. So even though I would love to see it, I don't expect that port any time soon.
This is all made worse by ATOs, Scrapper ATO's take scrappers from "Better than a Brute at Low Fury, not as good at high fury" to "Just plain better than a Brute."