Historically speaking, apple has consistently limited web app functionality on iOS since 2008. I think we would be much further ahead if it wasn't for Apple’s policies under his leadership.
Apple took over the distribution to prioritize a cut to the app store which crippled/slowed the open web PWA and WASM adoption.
Sure, and that's why Asm.JS(regular JS with special semantics) and later Wasm(bytecode translateable to JS) was so brilliant. It already worked on Safari, they had the option of either:
A: look slow compared to other engines that supported it
B: implement it
Now, stuff like the exception handling stuff and tail calls probably aren't shimmable via JS, but at this point they don't gain much from being obstructionists.