Brendan Eich was told to make ECMAScript "look like Java" because OOP was the happening thing in the 90s. It wasn't his fault that there are curly brackets and semicolons everywhere. Were it up to him, we'd have had Scheme for the browser from the start.
Ironically, WebAssembly is written entirely in S-expressions, but no one (in his right mind) will ever program in it.