The Thought Emporium did a video detailing a lot of this a few months back, plus some some experiments on how the actual limits to insect size can be bypassed.
This podcast interview really challenged my priors. In general highglight that a lot of the theories I believe might have much less evidence backing them than I thought.
paper (paywalled): https://www.nature.com/articles/s41586-026-10291-3
summary article: https://phys.org/news/2026-03-massive-insect-body-size-milli...