Temperature/environmental concerns are basically irrelevant because loom can be made out of the same or similar materials as the wire insulation. I know I've seen braided loom in small aircraft. I can't remember where though.
Cable lacing is usually the right tool for aerospace. It is not the solution to every problem like the internet thinks it is.
We had an issue with Airbus a few months ago where their own approved heat-shrink actually failed the flammability new testing (it smokes profusely...) We can now only use it in 50mm increments for protecting wire bundles from potential high abrasion sections (around connecters, through holes, grommets etc.) The weight aspect has never been discussed. It's so insubstantial that it's not even accounted for on our units. Occasionally we'll use shielded round-it for high voltage cables to prevent arcing, or sensitive data cables to prevent noise, but below that round-it is still wire and lacing cord. It's simply the most practical assembly method. The same applies to freighter ship looms too; lacing is not just relevant the aerospace industry!
I'm not gonna go lace up a DC but it's still useful enough that every hardware store around carries rolls of twine right next to the cable spools and zip ties.
Lacing looks cool but in 99 % of applications bundling cables is not just not necessary, but would be counterproductive.
Also PVC cable jackets especially for industrial cabling have come quite a long way since the 60s in terms of mechanical, chemical and UV resistance. The PVC sheath of an industrial cable is a couple cuts above the material used in the H03VV of the average desk lamp.