This SLF isn't travelling because there may be risk in the actual process of travelling but there's also risk at destination. Test me before I leave my home airport and I'm negative. I stay in destination for a long weeked or a short working week and test before boarding before I head home and again I'm negative. Troule is, I've been exposed while I'm away and, oh look, a few days later I've got it.
If I stay home I understand the society I live in and I can mitigate my risk, elsewhere there are different risks that I may not appreciate.
Once I'm vaccinated do I take off immediately? Probably not for much the same resons. The vaccination doesn't stop exposure, it probably doesn't stop infection but it helps me fight the infection. I'd rather not be infected, thank you.