[LEDE-DEV] New nagging message in Flash Operations page

[Mauro Mozzarelli]

Since the last update that took me to OpenWrt SNAPSHOT r6520-02fba1a / 
LuCI Master (git-18.081.35142-84b3ba4)

Under system->Backup / Flash Firmware


I get this nagging message inside a highlighted yellow box:

"Custom files (certificates, scripts) may remain on the system. To 
prevent this, perform a factory-reset first".


Well, my answer is: "of course I have customs files and certificates, 
otherwise why would I use OpenWrt in the first place and NO, THANK YOU! 
I will not perform a factory reset otherwise I will loose all of my nice 
customizations".

Is there any particular reason for this new message appearing? Is there 
a new substantial change in the configuration files?