"I guess to flip the question, what's the benefit of using a static HTML file over React, other than a 10kb footprint? " I can view it on my 11 years old N900

"I guess to flip the question, what's the benefit of using a static HTML file over React, other than a 10kb footprint? " I can view it on my 11 years old N900 which is still my smartphone in daily use.