Yes, E2E testing is a must have skill now. Also lock it from AI agent, they like to bent it to fit the code
If you want to stay employed in a world of agentic dev AI, you better learn the jobs and outs of testing.
E2E, integration, unit, mutation, fuzzy, static analysis. In AI-enabled codebases of any meaningful size, these just moved from “nice-to-have“ to “absolutely critical.”