Having seen a leg degloved on XC a couple years ago, I would never run at a significant level with naked legs or open fronts.
This happened at a CCI** over a solid corner topped with brush; the rider got in deep/off line, horse was slow to get the front legs up but managed to scrape over. They finished clear, but obviously did not show jump the next day. It was a former 4* horse competing at a lower level with a young rider; not a careless, young, or inexperienced animal. Just a bad moment.
I like my horse to wear safety equipment so he makes it home with his skin intact. I’ve used various boot styles…from the olde Style boots (and Nunn Finer knockoffs, which are still going strong), to Porters with vetrap, NEW boots (with and without fur lining), Woof xc boots, Professionals Choice (and knockoffs), and plain old neoprene brushing boots. Brushing boots are fine if you don’t have studs; with studs I want a tendon guard and tough material that won’t shred. If boots are sized and fitted correctly, they shouldn’t cause rubs (you can dust them with some gold bond powder too), but you may need to experiment with different brands to find the style that fits your horse’s leg dimensions.
I know about all the research about heat, etc. But honestly, 20 years ago we ran horses for 2 hours in long format wearing all sorts of boots and I don’t think there is any data to suggest legwear had any causation to soft tissue injuries. Every day horses of ALL disciplines are worked and ridden in polos, SMBs, fuzzy boots, various neoprene styles; some western horses wearing SMBs for hours…and few tendon injuries result. Is airflow better? Sure! But I’m not bothered by the risk of hot legs for 30 minutes of warmup and XC, on a horse who is properly fit and conditioned for the job. I’d much rather know he’s protected from a strike injury with his boots.