1. Performance & architectural concerns
"The observation that languages that are even slightly dynamic need dynamic JIT opts is very old; folks figured that out in the 80s." — pizlonator
"Their approach to numbers is broken. Their approach to measurement is broken." — pizlonator
"quickjs is hilariously slow. Midwits use it because it has “quick” in the name." — pizlonator
2. Viability versus existing alternatives
"If I was using this project for something I’d expect to write custom TypeScript for it." — simonw
"There is always AssemblyScript." — sroussey
"The main reason for this I think is getting cheap perf wins by running existing code natively." — timcobb
3. Credibility & AI‑driven hype
"I’m more than a little suspicious of how Vercel has made so much progress so fast." — acmnrs
"I think more human effort is going into defending this project than what was put into the project itself haha." — slopinthebag
"They landed 802,000 lines of code in a single commit." — themgt