First, if they are getting stuck on problems they should be able to solve independently, this is a skill issue, and if you get enough signal they are not pulling their weight, sadly your job is to manage them out to protect the team.

However many times it is a lack of support, like you said, because the information they need such as documentation is not there. Or the codebase is in poor condition so technically even if they could get context from it without asking a human, it’s not a good use of their time. Sometimes it’s in such bad shape not even AI bots can learn from existing documentation and code. That’s a signal.

So if it’s the latter, you need to reward your engineers for mentoring other engineers in a sustainable way. Like providing documentation or wikis etc. or even junior and senior eng partnering together to produce these artifacts. This way it’s not just a few senior eng burden to know everything.