What Michael Chabon took away from Nemesis, it seems, is that Data didn't die enough.
To my surprise, I agree. Data's flickering out was a more compelling version of Tasha Yar's return into a storyline in which her death had "meaning." What this show proposed with Data, specifically, went beyond the idea that death has "meaning" if it saves something: a beloved character, the ship, or the galaxy. An outcome such as that would lend meaning to anything, from flukes to cat videos.
Data's death also went beyond the idea that death has meaning if it's sacrificial, though that was the overall theme of the episode and even the season. "I'm considering the nature of sacrifice," Soji told Picard, sounding and acting exactly like Data when he'd bring his captain his latest quandary. Paraphrasing Narissa: "We destroy to give meaning to our parent's death and our forebears' sacrifice." And, "We've here to save each other," said Picard, while he died to help Soji see the light. Data himself subtly chastened Picard when he asked why Picard -- his measure of a man -- would believe that Data regretted his sacrifice to save him. Sacrifice for the greater good is itself a great good, and a Star Trek verity: the needs of the many...
But then Data boldly, calmly went on to put death in the context in which humans most often experience it. Not as something reserved for heroes, reluctant or otherwise, or as a far, far better thing that puts right all that went before. He implied that death was life's essential shadow, even its twin: its Lore or its Sutra. He spoke of death as a living awareness, as a truth that has no meaning but what it gives to life. What death brings to our ongoing mission as we live it, to seek out "peace, love, friendship."
Sonnet 73: "This thou perceiv'st, which make thy love more strong/To love that well which thou must leave ere long."