> If an LLM is typing that code - and it can maintain a test suite that shows everything works correctly - maybe we don't need that abstraction after all.

But this is a highly non-trivial problem. How do you even possibly manually verify that the test suite is complete and tests all possible corner cases (of which there are so many because synchronizing state is a hard problem)?

At least React solves this problem in a non-stochastic, deterministic manner. What can be a good reason to replace something like React that works determinstically with LLM-assisted code that is generated stochastically and there's no easy way to manually verify if the implementation or the test suite is correct and complete?

You don't, same as for the "generate momentjs and use it". People now firmly believe they can use an LLM to build custom versions of these libraries and rewrite whole ecosystems out of nowhere because Claude said "here's the code".

I've come to realize fighting this is useless, people will do this, its going to create large fuck ups and there will be heaps of money to be made on the cleanup jobs.