Blank panel are may-be not the most appealing "module" but they are useful and can save you lot of money. They prevent any objects to get inside your case or in contact with you power bus where they could create shorts and damage your modules.
So yeah blank panel are useful but they have some flaws. Rack are evolving, you add module, yo
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I love these blank panels
The perfect thing to fill out my case, and keep it from feeling overly crowded.
I am also using a few for some DIY projects.