In reply to Catriona:
There have been at least two rockfalls here in the past 20-30 years, both of which seemingly made the bad step harder. I was there in July 1986, the only time I've been to the top of Am Basteir, and managed down the step OK facing inwards with a little foot-placement guidance from a friend who was usefully coming the other way at just the right moment. It felt like a middling-grade scramble (and very short), although pretty exposed. I got back up alone no problem, and none of this involved a rope.
Was back there in June 1993 with three people including a Skye-based friend who, like me, had been to the top once before. We got to the step in rapidly deteriorating weather and both Chris and I were surprised to find it not as we remembered, and looking quite a lot harder. After a bit of faffing, one of the party got down OK and reached the summit while the rest of us decided against it. I had a brief scout along the top of the Lota Corrie slope to see if there was a reasonable alternative, but didn't fancy anything so we backed off with the rain arriving. I later heard that there had been a rockfall a few years before this (but evidently post-July 1986), and I think there was another one after that 1993 visit. As SimonCRMC says, Noel Williams in Skye Scrambles gives it as Severe (I think that was published in 2011 so there could have been further changes since then); I've been trying and thus far failing to find my copy of Shirley Bull's earlier edition, but I'm pretty sure she reckoned it was quite a bit easier at that stage. As with quite a few of the busier parts of the Cuillin, bits have a habit of falling off and generally it tends to get more awkward each time.