Strongly disagree. I have yet to run into a problem going through purely in-place upgrades since Windows Vista (To 7, 8, 8.1, and all the builds of Windows 10). Those whom advocate fresh installs due to "headaches" of in-place upgrades sound to me like they're lacking in ability to care for their OS installation.
I'll take running disk cleanup once over re-installing everything and refreshing from a backup an yday.
[Edited by Neo7, 1/31/2015 5:41:32 PM]
I won't do upgrades for a couple of reasons:
1. The upgrade takes forever. I can do a fresh reinstall off an image in ~5 minutes over the network. My "tweaks" are part of the image. Baseline applications (including Steam) are, too. Making an image, and restoring from it, is dirt simple; so much so that a particularly retarded monkey could figure it out.
2. I am not running the same machine that I had when Vista came out. Or 7. Or even 8.
The only upgrade that I trust is installed via the following command:
yum -y install dist-upgrade