-
They're big cushy trailrunners with a high stack height. If you're not used to the stack/don't have strong ankles, you could easily roll an ankle. Also, they'll got shredded by a high route, also they're grippy but not Bushido grippy. Also probably too chunky to maneuver your feet in properly technical terrain. I have them and wear them a lot but wouldn't tackle scree in them for example.
-
As JB said mostly. Bushidos are skyrunning shoes, they have low stack and a rock plate they're designed for alpine or high route terrain. Speedgoats are softer sole, a lot more stack and chusion and wider sole, plus no rock plate, they're designes for nice fire trails or cut dirt alpine trails, not scree or boulder hopping.
Sure you could use them for that, but they wouldn't be optimum and I wouldn't recommend it to someone.
What runners? High route means rocks, boulders scree. I've a pair of bushidos for that, which had 9/16mm stack so lots of stability. Wouldn't dream of that terrain in my speedgoats with 30mm stack.
Also depends on you personally, and how strong your ankles are. I can happily move over that terrain with my kid in the backpack in bushidos. But I've rolled my ankles a lot and they're stronger now. I like agility.
Nothing worse than doing/using something new on something new.