Because there are more effective forms of protest that don’t guarantee with 99.9% accuracy that a fascist is elected if people vote for an alternate party (literally the case this year with the margins, and “dictator day 1”).
Voting should be pragmatic. There are a million other ways to protest/lobby, but honestly the Democrats of today are far more progressive than 20 years ago, because of people who understand the system and change it from the inside, like AOC/Bernie.
One can appreciate the sentiment of the quote to value every minute while you have it, but under a more optimistic lens, the quote is not always true. I was 10x unhealthier 20 years ago than today, and I would give anything to never be there again. We all walk a different path.