If the paint coating for cars in Malaysia is around 200-500 ringgit. it makes good sense to coat your paint.
however, most "well known", "proven", "super-repellent", "US tech", "japanese tech" and etc. costs 1k to 5k. some last 6 months, some a year and some 5 years.
its better to just subscribe to a reliable car wash shop you trust. and wash your car weekly or fortnightly (for the lazy ones).
coating, in my opinion, is definitely the best snake oil yet (for car paint protection)
I cannot say you're wrong.
Coatings are similar to placenta treatments at any beauty salons. A "need" is created for it, and then hyped-up on the media by marketing puffery, and finally, as in direct-selling, creating loads of grandiose marketing stories. Great way to quickly increase monthly $$$ turnover. Its the current soup of the day.
I've played with loads of "coatings" (god..i hate that word. A coating of wax?? LOL) even before the 1st hyped-up brand reached our shores and Ive never been 100% confident in recommending any brand of coatings to my customers, and i dont talk about it unless they insist on it.
Even then, I'll give them a clear email before starting the job stating the pros and cons so that in future, no one can blast back at me sayng that i've cheated them.