That's what proper CI/CD is for.

Don't forget to ask your product owner which features are done. :)

If you have a proper CI/CD pipeline with a high build time test coverage, ship it. And listen to your users.

Like Adam says, if everything compiles and yours test pass - you should ship (in fact your CI/CD pipeline should automatically ship it). Deploying multiple times a day to prod is awesome.

If you wrote a test for it and wrapped it in a feature toggle, yeah! Feature toggles separate the idea of shipping code and shipping features. They also allow you to role back changes without a revert/redeployment!

It's pretty close to a startup strategy. As long as there are measures for "validating" and testing it, then yes. Ship it.

A good strategy only if it's the only possible strategy because of time constraints.

If there's time, doing at least some testing (and automating that, if possible) is highly, highly recommended.