Yeah, it's a bit disheartening to hear some (presumably) experienced people advocates for never allowing the junior to dig and deal with things on their owns.
I can imagine the scenario where a build fail due to some missing incantations that needs to be invoked, and sure, you shouldn't spend more than 15 minutes on trying to resolve it. But that should be rare, while the common blockers for junior tend to be their lack of understanding in even bog-standard systems and situations (why can't system X do Y, why did person Z require A). In those cases, part of the expectation when assigning them the work would be for the junior to learn those on their own.
I can imagine the scenario where a build fail due to some missing incantations that needs to be invoked, and sure, you shouldn't spend more than 15 minutes on trying to resolve it. But that should be rare, while the common blockers for junior tend to be their lack of understanding in even bog-standard systems and situations (why can't system X do Y, why did person Z require A). In those cases, part of the expectation when assigning them the work would be for the junior to learn those on their own.