4% usage doesn’t mean only 4% prefer it. It’s a buried setting that’s default off, that alone makes the choice for ballpark 80%. It doesn’t support mobile, which drops another huge segment, and it doesn’t support “new” features like images and tags, and Reddit spent years aggressively pushing everybody to switch. I wouldn’t be surprised if 4% is the vast majority of Redditors who actually tried both and had the opportunity to choose.