I gotcha, Forsoothe telling me I would soon understand. I assumed their growing out. Who knows what he's thinking. But to say it is problematic when there are amazing specimens...but alas, you nailed it with your post. So thanks.
I have already said that I have seen lovely examples. That means it can be done.
I said they are difficult subjects. They
grow very fast, just like all perennials do. Think about that for a moment.
I said they are short-lived by bonsai standards, I stand by that, too. We shall see.
The dwarfs are difficult to over-winter in Michigan's zone 6 because they need cool, but can't stand the length or depth of my winter. Montauk Daisy is an escaped plant with an established hardiness of USDA 5 - 9 along the east coast.
I said they are basically clip & grow (because they grow very fast), and that they wire poorly (because they grow very fast), and grow out of shape vary fast (because they grow very fast), and you will have to stay with them constantly (because they grow very fast).
I forgot to mention that the flower stems are very long, as in, measured in feet. I have had other kinds of daisies and had the same really long flower stem which made them somewhat unrewarding for all the trouble they are. Doing a lot of pinching for sizing and ramification will also deliver fewer and later flowers. I won't bother speaking to the strap-like leaves which will also force a style other than formal or informal upright. There are lots of other styles.
You would be better off just taking my observations for what they are: input; just one of a series of inputs by a variety of people on a thread. I didn't say you can't do it, or that I wouldn't do it, or that they would look ugly, or use one of my favorite predictions, "a fool's errand" ( which I don't shy away from using when I think appropriate (you may have noticed)). Instead, use what I have said along with others' comments and do your thang. Bona fortuna!