You are correct! I hadn't checked since I had an M1 MacBook, back then it was 6K (https://juicedsystems.com/en-ca/blogs/news/macbook-m1-and-m2-maximum-resoluti

You are correct! I hadn't checked since I had an M1 MacBook, back then it was 6K (https://juicedsystems.com/en-ca/blogs/news/macbook-m1-and-m2-maximum-resolutions-a-comprehensive-guide-to-video-input-connection https://juicedsystems.com/en-ca/blogs/news/macbook-m1-and-m2...), but it appears that since the M2 (according to the same website), the upper limit is now 8K.