Not sure if I agree totally. You need to make sure that the flukes are set and holding - not sure if that what you meant by “digg in”. You need to know that at a minimum to help determine scope, or even if it’s wise to anchor in that particular spot. If you know the anchor is set and holding good, extra scope is just a safety factor to what you already know.
If the anchor comes out - good. That something that you want to know while putting it out, not during the mid-watch.