Updates & the Server Tick

As a veteran / refugee from Blizzard's World of Warcraft, I was wondering why updates are rolled out on a separate day from the server tick? WoW's equivalent, the realm restart, would always have patches & updates rolled into it, unless it was urgent, so there would only be one day with extended downtime instead of a day with downtime and a day with restarts.
 
If they roll it out on a Tuesday, then that gives them three days to put an emergency hotfix together before the weekend if it introduces something really broken.
(they haven't needed to for a while, but it used to be a fairly regular requirement, and it's sensible to keep the option open)

It's possible, having settled into that pattern, that they would with hindsight also have put the weekly server restart on a Tuesday ... but it's probably too late to change that now.
 
If they deployed on a Thursday and broke something, then if they wanted to fix things before the weekend they'd have to deploy a hotfix on the Friday.

And for reasons that should be obvious, you never ever ever ever deploy on a Friday if there's any possible way you can avoid it. That rule is second only to "never deploy on Christmas Eve" (although this year christmas eve is on Sunday, making the 22nd the "absolutely do not deploy on this day under any circumstances" date)
 
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