One natural way to get more talent into EA organizations is to offer internships. Internships require only short-term commitment, and people can be much more exploratory about where they intern than about where they accept full-time jobs. Given that, I want to hear from people in EA organizations: what are the most important considerations in deciding whether or not to offer an internship? And why do so few EA organizations offer internships?
I am most familiar with the case of GHD, where no organizations regularly offer internships other than OP itself. The EA internships board has a number of interesting opportunities, but only some of them are in EA organizations.
My own experience, and my sense from talking to other organizations, is that management time is a significant opportunity cost, while the benefit (the work done by the intern) is both highly variable in quality and potentially not that great in expectation - not just because interns may be less experienced, but also because you probably put in fewer resources into the selection process, commensurate to the expected duration, cost and amount of work the intern puts in (all low relative to a full hire).
Some organizations leverage internships better, typically in roles that require time but not a lot of experience/expertise, and that require minimal supervision - but precisely because of that, the internship because less valuable from a talent pipeline perspective (since by definition you already have an existing source of free labour).