I like having a build step for code that I write. I build C, I build Go, I build C#. I don’t ship debug builds of those things.
I don’t know why I’d want to forego all of the niceties that a modern TS build brings and also ship what is essentially a debug build of JS to the browser.
Sure, for a really simple web page, I’ll just slap a script together. But for anything real, hell yes, give me a good build mechanism.