> The problem is, there are very few if any other studies.Not at all, the METR study just got a ton of attention. There are tons out there at much larger scales, almost all of them showing significant productivity boosts for various measures of "productivity".
If you stick to the standard of "Randomly controlled trials on real-world tasks" here are a few:
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4945566 (4867 developers across 3 large companies including Microsoft, measuring closed PRs)
https://www.bis.org/publ/work1208.pdf (1219 programmers at a Chinese BigTech, measuring LoC)
https://www.youtube.com/watch?v=tbDDYKRFjhk (from Stanford, not an RCT, but the largest scale with actual commits from 100K developers across 600+ companies, and tries to account for reworking AI output. Same guys behind the "ghost engineers" story.)
If you look beyond real-world tasks and consider things like standardized tasks, there are a few more:
https://ieeexplore.ieee.org/abstract/document/11121676 (96 Google engineers, but same "enterprise grade" task rather than different tasks.)
https://aaltodoc.aalto.fi/server/api/core/bitstreams/dfab4e9... (25 professional developers across 7 tasks at a Finnish technology consultancy.)
They all find productivity boosts in the 15 - 30% range -- with a ton of nuance, of course. If you look beyond these at things like open source commits, code reviews, developer surveys etc. you'll find even more evidence of positive impacts from AI.