Modern Linux distros. Yeah, I have so many complaints about them, but for a wide range of use-cases and hardwares, they "just work" now. In the olden days, Linux desktops and servers, and especially laptops were much more "pets" than "livestock", needing constant attention and care to keep them working, correctly configured, and up to date. Half the time when you added a new software package or piece of hardware you'…
Though to be fair, having explicit modelines was once also useful when modifying a BNC Trinitron monitor that ran at one very specific resolution to connect to VGA.
It's nice that monitors mostly just work these days.