Whilst I agree with the principle in general, there is a specific edge case that does go in favor of the Rogue with the current system. If you are Hastened (by Potion of Speed or the Level 3 spell) and have 2 actions per turn, the current implementation allows you to make a ranged AND melee sneak attack in the same turn as long as you can get Advantage on both; for example by Sneaking using both Bonus Actions, or attacking a Threatened target from range then closing, Faerie Fire etc.
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Sorry to say that is just wrong and it's got nothing to do with it. There is no edge case for the current system it just bad no way around it. You can do the same thing if the system works like smite. Smite has both systems active and passive as it should be.
