

There’s an alternative missing in all these graphics: Feet not on the ground.
If your feet are on the ground for hours and hours your heart will be in trouble to pump the blood back up all the way. It’s even worse with standing. So see to that your feet are not on the ground, rest your legs on some support under the table, sit cross legged (it’s feasible even in office chairs) and take every pose that’s not feet in the ground.
Your venes and your heart will thank you.
Updated Ubuntu over three or four LTS versions in the course of an afternoon several weeks ago - no problems, updated smoothly as fuck, machine (15 years old laptop) is running fine.
Anecdotic evidence is anecdotic.