My partner just made some fried rice with leftover potato chunks and mapo sauce and holy shit this is so good. We've also made di san xian a couple times and a veganized lychee pork and every time the potatoes have been fantastic, that gooey starchy surface cooked potatoes get is such a powerful sauce sponge. white people love potatoes, i don't get why the standard western Chinese takeout menu didn't seem to adapt any potato dishes
A lot of rich Western diets use potato as a starch only, while a lot of other diets will also use potatoes as a meat substitute.
So even if you have vegetarians looking for meatless options, a starch like potatoes isn't likely to be thought of as an option.