The more the time, the more the sadness.
It's like missing a dearly beloved friend, someone who has always been there. You never expect these things to happen.
Sometimes the loved one was more present, and there were times one barely remembered their existence. And then suddenly that lifetime friend is no longer there.
And then you miss them intensely, acutely, painfully, bitterly, hopelessly.
But the genius leaves a legacy behind. And one can rejoice with it. And celebrate their life and achievement.