I stumbled upon this topic on https://www.unity3dtips.com/zh/unity-fix-blurry-textures-on-mipmap/. I understood that I could simply toggle it on from Preferences, and it’s pretty cool that I can control texture values like mipmaps.
However, I was trying to find more information about the risks and what else I could be exposed to and achieve by enabling Developer Mode. I would appreciate any information. Do you guys use it? If so, for what purposes? Is there a risk associated with leaving it enabled? Also, what other interesting features can I be exposed to by enabling it?
No information available. This is a hidden (not public) feature, used only by Unity staff internally. Use at your own risk.
Seriously, for that? 
Mipmap bias is part of the API and I bet it can even be controlled by Importer presets. In any case it’s a simple editor script away from making it adjustable.
Either this author has absolutely not the slightest bit of professional attitude or experience with Unity, or ulterior motives.
Just to be clear, that wasn’t directed at you. 
I do wonder about the “tips” some folks put up there on the web, and this stands out as one of the more ludicrous ones. You are not at fault for following this advice, but the person publishing it should know better than this. This isn’t the first time I’ve seen this website providing bad advice - be it trivial advice, lists of every imaginable cause/effect, repeating what’s in the manual, or promoting outdated tech/processes.