One must distinguish between pure steam cookers and steam ovens. Steam cookers only go up to 100°, steam ovens up to 250°.
Thus, the range of applications is significantly larger with the steam oven.
It should also be considered: if you have a permanently installed steamer (I'll just call it that now, so either the cooker or the oven), then you will also use it more often. Luxury class are such devices with a permanently installed water supply (e.g., from Gaggenau), then you also don't have the problem of forgetting water in the tank and going on vacation etc. (so nothing can go bad).
If you then use such a steamer frequently (and I believe you simply always cook the vegetables in it then), you no longer need such a large cooktop and significantly fewer pots (in the steamer you work with inserts after all).
You can easily make all the side dishes together in the steamer.
For me, an ideal combination is a steam oven and a flat induction cooktop combined with a teppanyaki grill from Bora. You can then also use the grill to keep pots warm, the only weak point of induction.
I have to admit, however, that I am an absolute cooking and kitchen freak and am also willing to spend quite a bit of money on it. Anyone with a different fetish will probably tap their forehead.