It looks like the profile they're build on already supports those, I think the intention here is to present a sort of at a glance view that could be quickly analyzed.
Makes sense. In my opinion I would just generate fake flamegraphs then - they are much more readable and the format is dummy easy to fake.
Yeah, I actually generated these small charts out of a flamegraph, because it contains too much information and isn't easily split into three distinct parts. And once you condense the information into just 3 blocks, then using a flamegraph doesn't really add any further value, IMO.
/shrug that's fair, with only like four things its not that much more readable.