I often camp on rocky and gritty soils in western US and thus typically prefer to use a groundsheet or footprint with UL tent floors.
Over many years I’ve used fabric, PE film, Tyvek, and now polycro. Of course, polycro is lightest; and it seems good enough in my usage.
Alas, when setting up tent in wind, positioning UL polycro is intractable.
Also, with the “weird” orientation of Durston X-mid inner vs fly, placement of any untethered fly is needs inconvenient crawling and fiddling even without wind.
About 2 seasons ago, I cut a piece of polycro exactly to rectangular size I wanted for my Duston Xmid 1 Pro. This was chosen as about 3″ short on both L and W for 1.5″ shortfall on all 4 edges of inner bathtub floor.
Next, I used several short 2″ lengths of 3M clear packaging tape to semi-pemantly lock the polycro in place at the 4 corners and spaced a few places along rest of polycro perimeter.
I now have about 2 years usage with lots of dirt, rain, pine sap, etc. and all is good so far.
Added weight of spaced, intermittent packaging tape was about 6 g, which is less than the weight saved by making polycro a few inches short of full coverage of floor area.
Tape has held reliably, and I recently peeled off and replaced 1 piece without damaging delamination of the DCF ar that test location.
In severe wind during setup, a small amount of extra care is needed to prevent ballooning of polycro away from tent floor, but this is vastly easier than positioning without tape attachment.

