Yep. Most Subcontinent food is spicy/tasty not hot.
Sri Lanka is an exception, local restaurants refused to serve us the same as the locals.
Thai, on the other hand....
Vietnamese I would agree, but not so sure about Thai.
A (self-proclaimed) authentic Thai cookbook I used to have, said that the recipes were given using the number of cillies normal in Thailand, but Thais like their food fiery hot, it advised adjusting the number of chilies to what we find fiery hot.
Back in the day, ie nearly 40 years ago, we frequented one of the very few Thai restaurants in London (Bahn Thai IIRC *) - a basement place in Kensington. English guy front of hosue, Thai wife as Chef. One dish that caught us out was a minced beef dish with lots of French Beans, saw it and ordered it by sight. Lots of beans - only they were not beans, they were green chillies. I was a Vindaloo fiend then but is was way beyond my capacity!
* A couple of years later I was on a BA flight (to Sri Lanka) and the In-flight magazine had a feature on the top 5 Thai Retaurants in the World. Bahn Thai was on of them. It moved to Soho at some point and lost its distinctive edge when it softend lots recipes to a more general western palate. Shame!
Incidental comment. Vindaloo as served in most Curry Houses procaims its lack of autjhenticity by including potatoes and using other meat than Pork. From Portugese Goa it is based on the Potruugese dish
Carne de vinha d'alhos - meat marinated in Wine and Garlic. Nothing to do with Potatoes!
This is a good recipe:
https://www.allrecipes.com/recipe/217331/goan-pork-vindaloo/