[brianmcd]

> For example, a huge amount of UI problems we catch belong to the Screenshot testing stage. Fewer problems belong to the Linters / Unit / Render tests. That doesn’t make those tests meaningless. On the contrary, it could mean that we work in these areas well enough to prevent tons of issues.

They don't say how they measure "issues" in their chart, but if it's through CI failures, it seems likely that "Linters / Unit / Render tests" catch fewer issues because developers run them locally before pushing code.