Patch day was Friday
Then all the hotfixes would occur after/during the weekends raids, and the addon developers wouldn’t be able to catch up.
(Actually, back in the “good old days”, patches and downtime were often early morning U.S. time on a Friday. Unfortunately this was prime Oceanic raiding/instancing time. Thank god for Tuesday maintenance).
They nerfed toons to increase difficulty
Why make the bosses harder when they could just reduce your power by one level each patch.
Would Naxx 25 be hard enough with Deadmines powered toons?