I totally agree. I'm working on a system now that is the most complex I've ever worked on - managed K8s, OperStack, bare metal - all the provisioning, build and test infrastructure (dealing with nested virtualization, DinD, integrating build tools into tools that do things as low level as PXE boot servers). There's a huge amount of tribal knowledge required and I struggled with this.

Thankfully my manager was open to questions, and patient, it was me "not wanting to be a bother". But I had a meeting with my manager's manager and he talked about how stupid he felt, and understanding that no-one would feel like I was an "anchor" asking the "silly" questions of "Why do we / don't we ..." and persisting through that because everyone had been there.