Yet still consistency remains a challenge. As in the summer, when it felt like every high was followed by another low, England have again shown that pattern of having one strong display, and then not quite being able to follow it up. After Stokes helped England score 629/6 at five runs per over, they had an error-strewn display in the field, frequently dropping catches and handing the initiative back to South Africa. After running through the South African batsmen in the third test, the bowlers could never quite follow it up in the fourth, and again England were the victims of missed chances. The batsmen never showed enough fight, dismissed for 101.
England are still left with questions to ponder. Again, the batting is the most pressing among them. Compton and Taylor shared one of the most significant stands of the series on its very first day, but since then the runs largely dried up. With Compton it seems largely the same problem as in his first stint in the side: the pace at which he scores. And perhaps the issue got lodged in his head: at times he was calm and unflustered, at others he would be frenetic and taking uncharacteristic risks. He wasn't the weakest of England's batsmen and probably should have another chance in the summer, but he risks being leapfrogged by others before then. James Taylor will likewise be looking over his shoulder, having made less runs than Compton, though his fielding at short leg at least offers an extra string to his bow. Unlike Compton, he also has the benefit of limited-overs involvement to impress the selectors, and with tours to India and Bangladesh also on the horizon he should still be a prominent figure in selectors' thoughts.
Alex Hales though might have the most to worry about. England have come out of another series still considering their options at the top. Though four tests is hardly a fair run for Hales, with his predecessors generally being given seven games to make their mark, he remains in danger of the drop. So far England's hopes that he could become their David Warner haven't yet been realised and he's looked far from the confident, attacking player of the limited overs formats. Maybe it's part of that urge to prove himself in the test arena, maybe it's that the game isn't quite so suited to him. That said, Bayliss is looking for an attacking player in the top three and Hales still could be that man. He has a lot to play for over the rest of the winter, but so will many once the new county season begins.
So where are England at now? They've beaten both Australia and South Africa over the past year, drawn series with West Indies and New Zealand, and lost to Pakistan without completely disgracing themselves. It's a mixed bag really, and a reflection of a young team still finding their feet in many ways. But the hype is building, and it's easy to be excited. In the summer come tests against Sri Lanka and Pakistan that England will back themselves to win, and they will also want to build the sort of consistency and ruthlessness that the best teams have - no more one match on, one match off; no more heavy defeats in dead rubbers.
This series has in many ways shown what England are capable of - and what they still have to learn.