I'd make two cases:

1. In a lot of cases, even if you're pure vibecoding and not reviewing any code, its still useful to be able to read it - you can then verify and reason about various aspects. LLMs are often flat out wrong on niche issues of performance etc, so for cases like this, not being able to read code is a big risk.

2. "Languages optimized for LLMs" sounds awesome, but so far, to me at least, it seems like LLMs work best in the same situations as humans- good test coverage, low-complexity, clean architecture, etc.