It seems the Samsung Knox security services rely on the Android Strongbox spec.
It is not clear that a user would actually want to trade-off hardware based security (where encryption, signature verification happens in "tamperproof" / secure silicon) for some unspecified additional RAM.
In fact, the article does not benchmark RAM/CPU/Battery usage from the service. I would speculate that there is very little benefit in wanting a few MB of extra RAM when smartphones have north of 4GB of RAM and need strong security for payments and handling personal data.
It is not clear that a user would actually want to trade-off hardware based security (where encryption, signature verification happens in "tamperproof" / secure silicon) for some unspecified additional RAM.
In fact, the article does not benchmark RAM/CPU/Battery usage from the service. I would speculate that there is very little benefit in wanting a few MB of extra RAM when smartphones have north of 4GB of RAM and need strong security for payments and handling personal data.