Right; plus theres some capabilities where ftrace is (and maybe always will be) better. Eg, function counting: ftrace can count all kernel functions instantly (try my perf-tools funccount tool), whereas the BPF method involves setting a kprobe on everything, which takes much longer (setup and tear down). And function graph tracing from ftrace will likely be better than anything we can do in BPF (as it uses tracing all functions as well).