Literally Widows kit is based around being a one shot headshot. There is no other skill than aim and her cool down management is non existent since venom mine is a throw and forget about it and grappling hook should always be off cool down unless you’re being pressured 24/7 or just repositioning a lot.
Once you can land a headshot, there is no more depth to her kit. You can say jumpshots are a skill, but at some point it just boils down to aim again.
Having to aim as your sole development doesn’t justify making the enemy team have to literally adjust their play style for one character. No other hero demands that much from the enemy team with the exception of maybe Doomfist, but you can hold cool downs for him, can’t do the same for widow.