Surprise Maintenance

I really like the maintenance guys for CMU housing. They usually get right on top of problems (esp. if it's important). But sometimes it's also a bit startling.
I've only been around once when maintenance actually showed up (and I was in the shower nonetheless), but they have this habit of fixing things - without telling you. For example, I requested a mildew-free shower curtain last night. I get back to the apartment today and walk into the bathroom, and something is different. Low and behold; new shower curtain. But they didn't leave a note or any other indicator that they were there. This is fine, easily noticed - but that's not always the case.
Some of our lights require special bulb replacement when they burn out. So after requesting a new bulb you just have to flick the switch every one and a while to see if maintenance has been by to fix it yet.
I don't know, I just find it odd considering we've had paper for millennia, and email for decades.