From my understanding, there&#x27;s not a lot of performance benefit in most cases and a performance degradation in others. Also there&#x27;s some reluctance to change the behavior of existing code. Plus a whole bunch of unaddressed debugging issues (what does console.stack show?).<p><a href="https:&#x2F;&#x2F;github.com&#x2F;tc39&#x2F;proposal-ptc-syntax" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;tc39&#x2F;proposal-ptc-syntax</a>