I imagine it stems from Powerpoint or Word. If I move bolded header text from the bottom of the page to the top of the page, it would be irritating to re-apply

I imagine it stems from Powerpoint or Word. If I move bolded header text from the bottom of the page to the top of the page, it would be irritating to re-apply formatting. Once you have established this precedent, easy for it to infect the rest of the ecosystem.