Can we actually get a steady Out Of Combat?

defines out of combat as not taking damage and 5 seconds "out of combat" to apply effects. defines it as not taking damage or dealing damage and 8 seconds "out of combat". Ocean Drake buff defines it as not taking champion damage or dealing champion damage but Cloud Drake defines it the same as mobility boots both with the time of about 5 seconds.

Where is the consistency? I understand some of it is QOL buffs (like the mobi boots not disabling passive when attacking wards) but there seems to be no real consistency with the time or the reasons for out of combat.