'Heavy' doesn't make the world feel dangerous, it makes it annoying.
So this is something that didn't initially annoy me, but has gotten progressively worse as the weeks go on of doing everyday tasks, particularly beastmen quests. It feels like every mob, particularly higher level, has a potential to inflict heavy on you as you ride by. It feels relatively high to me, honestly. Like 10-20%. You have a couple options when this happens.
1) If you can jump off your mount and Esuna/Leeches/Tempered Will, you can lose heavy, but you have to sprint until you lose aggro/the mob gets 'leashed'. But there's still a chance the attacking mob can reinflict heavy. Which is truly a head-desk moment.
2) You jump off the mount, kill the mob, and usually heavy will be close to be gone/be gone. Go on with your way, until the next mob inflicts heavy, anyway.
3) You ride it out hoping it won't get reset by another attack...but it's, what, 20 seconds? Ugh.
It's been said that these mobs are so easy because they're trash mobs, and why make trash mobs a pain to kill? Well, why make trash mobs annoying as hell to exploration/travel on the same token? I wouldn't be upset if it was a move that normally inflicted heavy that inflicted it, like blizzard or stone...but a random punch? An arrow? Does not compute.
This just doesn't translate to a 'dangerous world'. It translates to a 'world of mild inconvenience.'