One of the weakest areas is analyzing heap dumps.

The current format has very limited tooling; "go tool" has some extremely rudimentary visualization. There is gotraceui [1], which is much better, though you need to use Go trace regions to get much useful context.

There's a proposal to support Perfetto [2], but I don't know if anything has come of it.

[1] https://gotraceui.dev/

[2] https://perfetto.dev/