I think some of you are missing “cause” and “effect” here regarding the effect of holidays on beta releases.
Assuredly, Apple has a master calendar for the release of betas and publicly released software. The calendar for iOS 18 was probably finalized very early in 2024 (if not before).
In that calendar they accounted for everything that goes into a year of “production”: among them, the number of major releases planned during the iOS 18 lifecycle, along with expected engineering challenges, and Human Resources availability. From those inputs they developed the release dates for each beta and public release.
I know the “Tim” references are (mostly) just (increasingly bad) attempts at humor. But the sheer mystification I sense regarding the major holidays baffles me. Apple didn’t just wake up last week and realize “Gosh, Thanksgiving is almost here, we need to adjust the release calendar!” No, they’ve known about it and planned for it from the beginning. Assuming Apple follows past practice there will be no beta released this week because they never planned to release a beta this week with most employees on holiday break.