Agreed, it's important to that the entire teams understands when someone is learning a new skill set or language. We try to allocate more time in our sprint for

Agreed, it's important to that the entire teams understands when someone is learning a new skill set or language. We try to allocate more time in our sprint for not only the developer who is learning but also for another developer on the team to help ramp them up. It takes a bit of working with the PM to determine what is a good task that isn't super time sensitive but it's typically a solvable problem.