Well,, if it is like WHQL then that may not be so bad.
Like in windows, you can still install Unsigned Drivers, you just have to allow them to install.
This will probably be similar. You can install unsigned software, it is just that your risks are higher.
The whole point to Signing software and drivers is a better assurance that what you using is legit and will work best within a Windows environment. That's all.
I remember once upon a time, that it was rumored that Microsoft was not going to allow any Open Source Software to run on Windows. This also turned out to be false.... Either from the start or by pressure, but false.