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.
Worth noting that a number of 1DaySooner research projects I worked on or ran have paid some undergraduates, grad students, and medical school students for supervised work on research projects, which is effectively very similar to a paid internship - but as you mentioned, it's very hard to do so outside a well scoped project.