As for fat-tire bikes, they've become popular, and they're great off-road, especially in snow and sand - and look badass. With the Sondors, fat tires meet e-bike at a surprisingly low price.
Gravel racing is uniquely positioned to embrace wider tires. Without a long-standing tradition dictating tire widths, gravel bikes have evolved rapidly, with many now accommodating 2.2-inch MTB tires.