Loose substrate is great. It really provides great enrichment for your dragon, allowing him to dig and make burrows. If done right it helps maintain a healthy humidity. Most "sterile" setups can get too dry, causing dehydration unless you are constantly
bathing your dragon or otherwise providing water. A deep substrate that is damp in the lower layers and dry on the top has really worked great for the arid dessert species I'm keeping.. better shedding less dehydration issues etc.
If you decide to go bioactive you mainly just spot clean the poop and critters clean up/eat up the bad stuff.. if you don't do bioactive you can go naturalistic which could mean changing out the substrate with new as it gets overloaded with waste, food so on.
Here are some good videos I've found on it you may like..
Here's a nice deep dive on a similar forum.. this person really knows what they are talking about. I'm in process of trying this..
If you don't want DIY.. too intimidating complicated etc.. try this..
The BioDudes complete 75 gallon Terra Sahara bioactive kit. This kit is designed for reptiles such as bearded dragons, uromastyx, leopard geckos, and other desert dwelling reptiles. Included with this kit is: x2 36 quart bags of Terra Sahara -The Dude's handcrafted substrate. Holds all...
www.thebiodude.com
Been using this product for many years and its great! Gets expensive though on larger enclosures.