N. McClure-Griffiths, S. Stanimirovic, und D. Rybarczyk. (2023)cite arxiv:2307.08464Comment: Manuscript (48 pages, 11 figures) accepted to Annual Reviews of Astronomy and Astrophysics for publication in Volume 61. This is the authors' own version. The final version, and associated supplementary material, will become available from: https://doi.org/10.1146/annurev-astro-052920-104851.