Much drama about a Bumbo recall. Of course babies can fall out of them...there's no harness. They are designed for use on the floor only, which is outlined on the package when you buy them. They are meant for babies who can sit up with minimal support, and should not be left unattended.
Because that is apparently too complex for some people to grasp, the manufacturers are sending you kits to attach a harness to them, which I think defeats the purpose of the design. It will also cause the idiots who originally ignored the instructions and left their kid unattended on a table in it to assume it's now safe to do just that.
If you can't read the instructions on a baby object, or even barring that, use basic common sense that would dictate that leaving a baby in a seat with no strap on an elevated surface is unsafe, you may want to reconsider the whole parenting thing.