The video on left hand safety is really, really interesting.
However, I would say there is no one size fits all solution. There are general things you can do that work for most people but we all have different bodies. I did a strap length video in which I point out I have long gangly arms which makes the equal seated/standing bass height quite hard to achieve without bending my wrists over. Actually, a lot of different techniques and musical ideas are the result of physical idiosyncrasies. Allan Holdsworth and Django Reindhart are obvious examples.
As for ignoring the possibility of injury from bass playing (as is mentioned in the Youtube video comments), that is a ridiculously stupid attitude to have. I've known women that have developed fairly bad back problems just from carrying a handbag or wearing high heels all the time. So doing something as unnatural as playing an instrument and straining the small tendons and ligaments involved can certainly cause problems. I have a particular bee in my bonnet about this because I've injured my back quite badly from the rigors of touring and playing A LOT. I've also suffered hand problems in varying degrees and had to adapt my playing and posture many times to find what works right for me. Watching and learning from so called big name players is not always the best way since they might not have the same body/arms/fingers as you and don't fall into the trap of thinking they play as much as you. I went through a phase for maybe 6 years where I was playing on average six 45min-1 hour sets per night, every night (no nights off) with a few weeks break every 6 months or so. That playing was separate from rehearsals and practice time. I remember thinking at the time about how that would compare with your average 'rock star'. . As a result of having a heavy Fender Jazz hanging round my neck all that time, I now have serious lower back problems that are unlikely to heal or be fixed. If I'd known more about the pitfalls involved I doubt I would have the problems now because I now know the mistakes I made.
If you feel 'pain' then stop using that technique and modify your hand position until it stops hurting. If you just feel a bit of a muscular pull, don't worry about it quite as much. Your muscles may just need to adapt. Try a bunch of different positions until you find the one that feels right for you.
Mark