Maybe. But the cognitive load of learning a new language (and programming correctly in that language) is real. And even more real is the emotional stress and m

Maybe. But the cognitive load of learning a new language (and programming correctly in that language) is real. And even more real is the emotional stress and mental turmoil a person faces when they're required to learn something new rather than pick up something familiar. When someone has deadlines, a home life, strong demands from their boss, familiarity with build pipelines, a team full of people that they can call on, etc, it's often easier to keep the stress and confusion count lower by sticking to the familiar. Especially when, in cases like Python with types or Java with Lombok and "just one more thing" will "fix" the rough edges or difficult scenarios that the those specific developers have. Sure it's "one more step", but it's probably a small one and one they can reason about without having to upend their entire mental model (even if in practice they might not need to).