Like the 966k of JS on your homepage? ;)
There are several things to consider with download time:
- is this a website? why on earth do you need react or anything for a website?
- is this a single page web application? then to develop with a medium sized team and an increasing feature set its nice to pick a language and library/framework that enable that.
- do you really care about mobile users performance and bandwidth? then you need a native app
This is all unrelated to the article, which is merely an uninformed rant about someone who doesn't understand the point of immutability and its use within functional programming as opposed to shoe-horning it into imperative code.