Sorry, but you're just wrong about that. Speaking specifically of Amazon & Newegg, in recent years, you can genuinely find some deals on those days which are decidedly better than any time before/after. It's only certain products or models, so either you get lucky or you need to be flexible to truly capitalize on it.
In general, I agree. My low-key tech hoarding paid off, during the pandemic. In general, it's a losing proposition to buy something before you need it.
Having said that, I'm making a couple strategic PC component buys, during this low spot in the market. I don't want to get caught out, when the next crisis happens that triggers the return of pandemic-era pricing.