Basically the title.
Keys shouldn't sound an alarm which can be heard around most of the map, or even at all, because it's a key. Keys don't sound alarms, that's the whole purpose of a key.
An Outpost armory or the red key room don't sound alarms heard around the entire map BECAUSE YOU HAVE A KEY. Opening a lockbox with a key doesn't sound an alarm heard around the map BECAUSE YOU HAVE A KEY.
Pinwheel sounds an alarm because YOU MUST HACK INTO THE SYSTEM to actually open it. Wall safes and secured resources sound alarms because YOU MUST HACK INTO THE SYSTEM to open them.
I also dislike they key template system because it just makes us go sit in a corner for at least 5 mins then exfil. It is just boring and tedious. When we buy a key, we should just get a key we can go use. It should just give us a key to a random room. I've bought several purple templates and it hasn't happened to me, but I've heard they can turn gold upon exfil. The same thing could still just happen when we buy a purple key if we get lucky.