TLDR: standing all day long can be worse than sitting, but alternating standing and sitting positions is very good for your health.
Standing desks have never been promoting standing all day imo, the title is pure clickbait. Standing desks are good for your health, just use them correctly.
Agree with this, especially about movement. Overall the main bad thing about regular desks and comfy chairs, is that you can sit at them without changing your posture for hours, which is bad for everything: blood circulation, posture, muscles, etc. "The best posture is your next one."
I work from the floor now mainly... it's cheap, portable, forces you to move, doesn't require anything besides maybe a few pillows and any coffee table or raised surface for a laptop.