The amount of memory used defines the size of the state space of the system — with exponential growth in the number of representable states. The amount of testing needed to have confidence in the behavior of a system grows (and I’d state based on experience, but without proof, grows faster than logarithmically) with the size of the state space. Building smaller, simpler systems is still the key to being able to realistically test and define behavior at high confidence levels, regardless of the price of a bit.