Using ES5 is not irresponsible, but your justification comes across as petty. If you had claimed your workflows and toolchains all rely on ES5, and you don’t/ca

Using ES5 is not irresponsible, but your justification comes across as petty. If you had claimed your workflows and toolchains all rely on ES5, and you don’t/can’t invest in changing now, I would understand. Syntax? Get over it! Languages evolve. Syntax evolves. Refusing to update with the times ultimately hurts you more than your clients, as it dulls your skill set.