I used aspen for a long time before i decided i hated it. Poor for humidity... i do the same thing for my frogs, snakes, and lizards.
I use my own home blend of natural soil, tropical soil bedding, coco fiber, charcoal, and a few other things. Its bioactive so i scoop out big poop and mix the rest in. Im a picky man so i havent put real plants in yet. But.... i moisten it once a week and it keeps perfect humidity with the diy foil top, or like i did, make a custom lid... almost never have to change it if you maintain it.
Point being yes i think its more paranioa than anything. Even before i went full time feeding in a separate tank i had no problems. Vents always clean and no digestion issues. I mean theres dirt in nature... so... Aspen and soil alike compact after the snake wanders a bit around the bedding. Its more personal opinion than anything i think