I observed that if I used the belt sander (40x/60x) to remove lots of material aggressively, a thick coat of dust could be seen on the front part of the hose. None if used with the PRO5 LTD (100x and above).

If I grounded the hose, would that make a difference? It seemed so (see the last image). There wasn't any layer of dust, just scattered dust particles on the hose. But further field tests/uses will be needed to see if this is actually something worth doing.

Test done with -

2x4 block: about 12 - 15mm surface material removed

Grounding kit:
https://www.leevalley.com/en-ca/shop/tools/workshop/dust-collection/parts-and-accessories/62616-grounding-kit-for-dust-collection-systems?item=03J6201&utm_source=free_google_shopping&utm_medium=organic&utm_campaign=shopping_feed&gclid=EAIaIQobChMIwfOs3YOy9gIVEhDnCh1snQhsEAYYASABEgJHyPD_BwE