That's the nature of exponentials. It will look like we have a lot of headroom to spare, but in a couple of steps - wham.
Exponential doubling run backwards:
100% - full.
50% - one step earlier.
25% - two steps earlier.
Two doublings before the limit, you look around and see 75% room to grow into - why would there suddenly be a problem, there's so much room for manoeuvre, stop worrying.
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Why would things suddenly get "so complex"
That's the nature of exponentials. It will look like we have a lot of headroom to spare, but in a couple of steps - wham.
Exponential doubling run backwards: 100% - full. 50% - one step earlier. 25% - two steps earlier.
Two doublings before the limit, you look around and see 75% room to grow into - why would there suddenly be a problem, there's so much room for manoeuvre, stop worrying.