I'm actually well aware of this and didn't mean to offend people. And 30% is actually quite a large percentage.
I actually make ghee myself sometimes from butter (easy and a lot cheaper than buying it from the super market).
A lot of (british) indian restaurants use cooking oil instead and I'm well aware that that's not the same as what people in India would consider Indian food and that something like a Tikka Massala is not actually a thing you'd find in a proper restaurant in India; which is a country I've never been to and would love to go to to experience the food.
But anyway, a lot of these restaurants use cooking oil because it's cheaper and because it makes everything they cook with that vegan by default. Which at least in places with a lot of vegans is a nice feature.
Here in Berlin, finding decent Indian food is a bit of a challenge in any case. Germans are hopeless with spicy food. And I know only a few Indian places that add more than homeopathic amounts of chili. Most of the Indian restaurants in the more touristy spots are owned by one family and those aren't great. I've gotten some tips from Indian colleagues over the years for better options.
Anyway a lot of dals indeed don't use a lot of spices or flavoring. And that's just sidestepping all the different regions and food styles. Which are a thing as well of course.
As for Malaysian/Indonesian style cuisine; I'm Dutch and got exposed to a lot of the Dutch Indonesian food which, similar to British Indian food is not really that authentic. Lots of meat in there indeed. And quite spicy.