To expostulate, if you have a computer with a Pentium 4 or newer CPU, as a Flash developer you can use the high performance Papervision 3D, or if you want max details, there is Away3D, and then the original Sandy. When you say "sufficiently advanced" that's a very subjective term, as some of the websites using these 3D API's are quite advanced compared to other websites built in a different technology, such as Java or Microsoft's Silverlight. If you had said "sufficiently advanced" and compared it to something like 3D done by modern computer games or a video game console such as the Sony Playstation 2, then yes, Flash is still a ways off, but these 3D engines for Flash 9 combined with the JIT compiling that Actionscript 3 uses, is what I would call sufficiently advanced compared to Actionscript 2 (interpreted), for example.