As someone who develops software on both PCs and Macs I can tell you that it's much more difficult to get things working consistently on a Mac - particularly invovling threading, multi-core processing and true 64-bit operation.  Apparently, most of these issues are going to be addressed in Snow Leopard (10.6) which will support a true 64-bit kernel.  It will also require anyone developing 64-bit apps to use the Cocoa framework api instead of Carbon which is a nightmare in itself.  Not trying to make excuses for e-on or Apple but it is what it is.