Wok hei is not possible at home, the charred taste you get is unique.
I simply just do not think wok hei in stir fry dishes is obligatory for a stir fry dish to be fantastic.
Wok hei gives you this unique smell and scent in the stir fry, but for me stir fry dishes made in a wok without this unique charred scent can be as good or even better depending on the ingredients and spices used in the stir fry dish.
Also if people in general find food prepared in a wok oily and unhealthy, they really don’t know how to cook in a wok as wok food to me is some of the most healthy food on the planet.
So I totally disagree about wok food being overly oily.
You determine yourself how oily wok food should be, unless you’re eating out in a restaurant, which exactly underlines my point about home made wok food being as great or even better tasting than restaurant made wok food.