This may sound harsh but I don't intend it too, though I will freely admit my bias. I also find the echo chamber effect pretty fascinating
Being rooted in beliefs, sometimes to the point of being condescending to things that are in disagreement with them, doesn't ultimately benifit the animals in question...
Out of curiosity have you looked around at other groups that espouse these same philosophies? It's been a minute since I browsed that particular group, but I found it the most rational of the beardie groups on FB.
There are two sides of the coin, and many of the groups that promote what those in this thread would consider totally unacceptable would find the tiles 40g tank a torture chamber. I've seen a lot of care and consideration go into habitat design and the overal care and health of the animals. I've seen more informative posts about ntural history, equipment, diet and enrichment on those groups than ever comes up here.
Specifically in response to the examples you give...
Baths aren't needed. If you find your dragon doesn't stress then no harm no foul but even this forum is finally letting go of the myth baths
hydrate by any means other than
drinking. Many animals find them stressful. Dehydration shouldn't be addressed by an unnatural method - baths are no replacement for proper diet/water provision and humidity. There is a weird dissonance about water, swinging from these dessert animals and need it super dry and no water dish to they need regular baths for health.
Loose substrates aren't the villain of the story. Sorry but again the blame for that falls on care and husbandry. While I don't agree with loose sand since it's not the ecology these animals are from, I continue to use a sand/soil mix for my animals and promote it to interested keepers. That doesn't mean it's for everyone and it isn't for every animal but it's not a boogyman. As for benifits? For me it means I can have a larger and more enriching habitat with less concern over cleaning and dealing with sanitizing the 50-100lb or so of furnishings in each of my cages. I don't have to go on poop hunts. Pepper can hunt/forage through out the day, dig if he wants to, and I can simulate rain which most of my critters come out for to have a drink. Many significantly more sensitive animals cannot be kept in captivity the way dragons are commonly kept. They die from stress.
Fear doesn't make it right to deny animals the ability to express natural behaviors. It's good to be cautious and it good to understand your limits but its not ok to pick a belief and stick with it and not be willing to learn beyond what's on a
care sheet. Wild dragons travel about, dig and climb tall trees; but popular care practices would keep them in small, short cages and in a solid floor. Sure captives aren't the same as their wild cousins but they aren't so far removed as to be fragile wilting flowers. With special cases aside, the conditions they receive in or care make or break them.