[brigade]

Your first example is a CPU limitation that Instruments doesn't model (does perf?), but is still mostly better than Intel chips that are limited to 4 dynamic counters (I think still? At least that's what I see in the Alder Lake's Golden Cove perfmon files...)

Your second example, is the complaint that Instruments doesn't have flamegraph visualization? That was true a decade ago when it was written, and is not true today. Or that Instrument's trace file format isn't documented?