The logging examples given don't appear to be too different to what any structured & annotated logging mechanism would give you. On top of that it's normally encoded with grpc, so that's already one-up on basic json-encoded structured logs.

The main difference I see with otel is the ability to repeatedly aggregate/decimate/discard your data at whatever tier(s) you deem necessary using opentelemetry-collector. The amount of data you end up with is up to you.