My recently retired TB is known as the super pony (no, he’s not actually a pony, but it sounds better than superhorse) - I trust him with pretty much anything. Except miniature horses, especially when they are pulling carts (they all have to have something, right? one of the neighbors trotted a mini across the field while we were riding and let’s just say we could have taught passage that evening). I’ve ridden him with fireworks going off without him blinking though (not intentionally, but random winter evening ride in the dark and the neighbors started setting them off, so…) and we used to take off for 2 hour rides into Hitchcock Woods by ourselves with zero concerns. He’s also very used to being ridden entirely in the dark, by headlamp, etc. as we tried to keep him upper level fit around my work schedule in the winter.
The new baby TB has a brain, but he is more easily overwhelmed at this point in his life. He’s been ridden with construction going on around him though (roofers were initially terrifying), as well as been off property for a bit fitting with 30mph wind gusts and been chill, so I think there’s hope for him with more exposure to life. He’s definitely a social butterfly and wants to know what everyone is doing.