How important is ATS score..?

To all the recruiters / hiring managers / successful hustlers,, how important is the ATS score... what is a good score.. and are adding all the quantifiable numbers as suggested by most resume builders really needed? I'm saying like adding some metrics evvvvery line ? Doesn't it look fake or like "generated" and make it lose the human touch..

how does the process really work? I know there are hundreds of videos and loads of content out there on resume building advice, but still I just wanted to know if that is how it is directly from the recruiters who see through these processes every day...

it is difficult to apply every suggestion or avoid certain things that are otherwise asked to be removed by the builders.

Do these really help crack the first stage of screening..