Tony Vargas
Legend
I suppose the "simplicity" goal could be called (small-g/non-Forge) gamist.That's just it - there's a few elements of 5e design, of which this is one*, where it very much looks like the designers approach was a completely gamist** outlook and their specific intent was that players would in fact be somewhat expected to exploit these loopholes.
Heal-from-0 and death saves/death-if-you-take-your-max-hp-in-one-shot /not/ tracking negative numbers surely must have seemed simpler than tracking them.
I don't get a feel from 5e design that the potential of players to exploit loopholes was highly prioritized - neither in the sense of closing loopholes for the sake of balance, nor discretely holding them open to 'reward system mastery' - rather, whether something is a loophole being exploited or players having fun, is the sort of judgment 5e design leaves to the DM.
JMHO.