> Is it mainly about how the main/orchestrator agent communicates with its subagents ?

Yes

> If desired the user can always see what the sub agent is doing in detail ?

Well, no, that's the problem, you're currently not allowed nor is it even possible, to see the exact prompt the main agent sent the sub agent. This is the problem.

> Isn't it the same in case of claude as well ?

No idea, but if Claude Code makes it so it's impossible to inspect what the sub-agents actually received before they started their work, then I'll say it's similarly impossible to rely on Claude Code if so.