I completely agree with your statement. The key difference between my statement and yours is that I wrote "any given day" and you wrote "over time". The market is absolutely not random.
As an example, I feel like "over time"... the market is going to go up. Monday could be down another 2-3%, up 2-3% or flat. I have no idea.
My personal GUESS based on how everything sold off was that one or more large holders of equities was shifting their holdings over the last few days. Thursday morning started out moving up around 1%. With no precipitating event or substantive news, the market quietly turned and sold off in a very orderly fashion from there until the close Friday. When this scenario has happened in the past, sometimes a few days later we hear that some institution moved billions and billions in equity to another asset class. Since they are moving so much, they just slowly and methodically deal it all out there until the transaction is done. Are they finished? I have no idea.
This is my take as well as we both suggested in a previous similar move in markets. Friday's in particular have often been weak for no particular reason. The drop on Thursday seemed pretty natural given news and profit taking. I also don't pretend to know what Monday will bring but with Cdn earnings season coming soon and Cdn stocks still being relatively cheap there may be opportunities here. My overall premise remains a moderately positive US market by end of year with a lot of choppiness getting there.
Sector rotation has occurred all year. I believe the Cdn Oil stocks are oversold now due to index related selling and weak hands. However, commodity prices can distort things in either direction short term. Earnings coming up now I believe are a strong bullish opportunity in this area still ( should be great numbers, some dividend increases, some share buyback announcements, some positive news on reduction in hedging losses ).
US indexes in general are just a mediocre unpredictable trade in 2022 other then shorting weaker QQQ stocks. If someone is long the right areas, they'll be fine and some trading around the drops even better. I try to buy stocks that even in the worst outcomes will likely be no worse then b/e end of year. There are plenty of those in Canada at the moment.
I have a bit different perspective though...I believe a successful trader only needs 3 things. 1) Current and past price data 2) A complete news block on current events, and 3) A reliable neighbor to let you know if a nuclear war has started.