No, you don't need to reinstall Steam games during a Windows reinstall.
No, you don't need to reinstall Steam games during a Windows reinstall.
You could wipe your SSD and remove all saved games from Steam before reinstalling Windows 10, then restore them afterward for a smoother experience.
Same as before, unless you save it to your SSD. Then simply move the games from the "common" folder and the "appmainfest###" file—replace the #### with the game's store ID (you can locate it on the game's store page).
I tend to skip copying the Steam library or backing it up whenever I install Windows. I usually do clean installs because I don’t need much important data and just save what’s needed on a USB drive for later use. My game partitions are around 500GB and my Downloads folder is about 400GB, which makes it hard for me to decide what stays and what goes. Since I have a relatively fast internet connection, I can easily retrieve files again. I’m not sure exactly how HDDs work, but I think if you store things on a separate partition, it might be slightly quicker to locate them. If that’s the case, you could look into it a bit more.
It shouldn't matter unless the files are corrupted or absent. Check the game's files in the Library if you see problems.
When you format the drive, all your games will be deleted. If they exist elsewhere on another SSD or HDD, just find the folder and add it back to Steam. Simple!