Unless you want to go back to 10 years ago when a single CD-key was used on 100 systems, then getting key blocked from online play. Or would you rather have the shitty DRM that blocks you from installing the game more than 3 times?
Steam is by far the most effective method of piracy prevention as well as providing convenience.
The orange box games are now attached to your account. So now you can download the game content to any system you log in to, without requiring you to have the disc.
The benefits far outweigh the conditions. How hard is it for you to just connect to the internet?