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boredom
There's a really good TrainerRoad blog post from when they introduced this. I can't find it now. But the tl;dr was that it's kinda the opposite: the suffering, pacing and other issues associated with traditional 8/20 minute tests tend to underestimate your FTP as many (most?) get their pacing wrong or there are other issues.
They tested it with over 7000 people just in beta so I reckon it's probably fairly accurate.