over heal shielding vs grievous wounds rant

so i've been noticing around the boards that they are having a kick about adc "abusing" fleet footwork heal, and double relic sustain going into durability from the overheal rune yet i've checked on this rune, and it gives a whopping 10% hp scaling shield +10. most adcs i see usually have less than 2k max hp so that shield is less than 200. if you ever think that is op or something like that just take something with grevious wounds so that they can't build up that pity shield, although i'll note on that it not disappearing like the shield is neat. other than that i wouldn't sweat it on adcs just on tanks with health regen that doesn't scale off of missing hp or consume hp to proc