Author here. It wasn't a recommendation, it was just the only way I knew how to. "uv pip list --outdated" indeed has much better output, thanks!

Though this makes me wonder why are there 2 ways of viewing outdated packages, with wildly different output? The UX is mess...

"uv tree -od1" probably works. But yes, critique of pacman and other managers was that it needed to offer human sounding commands for frequent commands, like apt does.