Some corsets look awesome, especially the really well made ones. They're very popular outerwear for costume/theme parties/cosplay and such. Thing is, even the best corsets can have some serious constraints on movement and such. You can't drive, sitting down means that you are forced into a ramrod straight position, and going to the bathroom is a nightmare. Think about it: you can't bend down to the necessary things to your garments, follow certain hygiene procedures easily, and you're pretty much doing everything by feel. Outside of the toilet, you can't sit down on a soft seat otherwise you've nothing to brace yourself against when you have to get up again. The harder the chair you're on, the better, but regardless of where you sit, the boning will end up digging in somewhere. Asthma can be an additional problem. It can be brought on by the laces being too tight, or it can be brought on by you thinking that the laces are too tight. Speaking of laces, you can tie them by yourself- some people tie them on doorknobs and use their weight to tighten them that way- but it takes forever to do an acceptable job and the more complicated decorative knots you'll likely need help for.
Of course, all of these sorts of things are going to be less of an issue if you're experienced at wearing corsets in general, and obviously if you're wearing an underbust, or even a short overbust, you'll have a lot more flexibility in the arms and shoulders, as opposed to a full corset that goes from hip to the top of your rib cage. But an underbust corset will still make bending down pretty much impossible, and you'd be amazed at how much flexibility you need in the waist to sit down and drive a car safely. Regardless of whether you're wearing a corset for the looks, or for waist training, or for those people who have to wear them for orthopedic issues... these things can really fuck up your movement. If you go to work on a bus, I daresay you'd be okay. If you have to drive to work, you're running a decent chance that you'll not be able to to look over your shoulder or steer the car out of trouble quickly.
Waist training is bad for the health, but it can be surprisingly unhealthy for other people as well. And it's fucking uncomfortable. There's a reason why corsets fell out of fashion sharpish when elastic came into use.
