Yeah, I've never understood the obsession with people not wearing protective gear. It made some sense with Prometheus purely because it was a high tech scientific expedition, but for this film it's pretty weak.
I mean the entire history of human exploration is full of people going to places where they know there are illnesses that kill people but they have no idea how it was transmitted. Take David Livingstone for example, he lived large portions of his adult life in sub-Saharan Africa in full knowledge that malaria was a thing and that people died from it regularly. He even brought his family with him for a while until they couldn't handle the illness anymore.
We know, from looking at the historical behaviour of humans, that people are totally reckless in this field.
It's just a silly criticism.
I also have a problem with people complaining about Millburn's behaviour towards the snake thing (do you really expect me to believe that Charles Darwin never did anything reckless at all during his voyages to collect samples and do detailed drawings of the natural world?) but that's a different topic all together.