Ask HN: Is front end testing a part of your dev team's workflow?

I've read a lot about different front end testing techniques and frameworks, and also written a decent amount of front end tests (unit, integration, e2e). I have yet to see the value, even over time, compared to the cost of writing and maintaining those tests. Tests for the back end is a different story, especially with a RESTful API. However, I'm curious if there are other teams that have had different experiences, and if so, what tools are you using to conduct your tests?