Not sure I’d agree with this @PamPurrs - Pam. Kinda like saying that piano and keyboard players are meant to sit while they play…
There are many bass players, guitar players, etc who play sitting…. Many disabled vets and others in wheelchairs kinda have to…
Sit, stand,… doesn’t matter as long as you’re comfortable playing in whatever position you might choose that works for you…
For me, I practice and play both standing and sitting. Hell, who knows, there might come a day when I too end up in a chair……
When sitting I never use a strap (even though we’re told that we should). When standing I do have my bass hanging a lot lower than it is when I play sitting down.
I find that when I practice and play in both standing and sitting positions, my bass is never in the same location so I kinda just train myself to play the thing either way.