I would certainly hope that nobody is blaming Boehm. He's provided a valuable tool that has some practical limitations, which are probably mostly due to the nature of conservative garbage collection.
However, it's worth noting that you can't easily mark/annotate all data structures, especially when large third-party libraries are involved, and it's not guaranteed to solve the problem. Implying otherwise might dangerously mislead people.
As an example, look at Mono, which gives the GC very precise information [1]. Even so, at least some projects suffer ever-increasing memory usage when run under it [2], which the Mono team are fixing by writing their own garbage collector.
However, it's worth noting that you can't easily mark/annotate all data structures, especially when large third-party libraries are involved, and it's not guaranteed to solve the problem. Implying otherwise might dangerously mislead people.
As an example, look at Mono, which gives the GC very precise information [1]. Even so, at least some projects suffer ever-increasing memory usage when run under it [2], which the Mono team are fixing by writing their own garbage collector.
[1] http://www.mono-project.com/Mono:Runtime#Garbage_Collection [2] http://www.mono-project.com/FAQ:_ASP.NET#Memory_Usage