Many things are not testable. Not sure I'd use that as a reason to judge someone down. In fact all the most productive teams I've worked on or with, don't have anywhere near full test coverage. The best had none in fact.
For eg. One feature require backend & frontend work, after a week of work engineer says that this is done. So you ask him to demo, and it turns out he is doing a backend demo with some dev tools.
From a product perspective nothing has changed. Top engineers understand, that no one cares that only one part is working, they know the end user and will not bother managers/product owners with partial solutions.
In fact I can think of at least 10 sites in the alexa top 100 that don't have any tests.