I don't know how to nicely tell my assistant to give it a rest with suggesting adding things to our mail room

I get that Sam's worked for the fire department and other safety-related jobs, so she's kinda by-the-book when it comes to having a safe and efficient workspace, but it's getting a little ridiculous. Some of the additions to the office she's suggested make sense, like having a blade disposal container for our box cutters, but lately, she's added a whiteboard and most recently she's suggested another for our vendors and carriers to call. I think the whiteboard iwas unnecessary, but at the same time, I don't really care about it all that much (though it's been in our mail room for about a month and as expected, we haven't used it once). But having a little hotline for vendors and carrier is just way too much. There's nothing innately bad about that idea, but that's what my phone is for. And it's not like I get calls from companies all the time. It's actually quite uncommon, so having a designated phone for that is completely unnecessary. I like Sam, but again, she's getting too by-the-book with this stuff. And I'm not sure how to tell her in a nice way, lol.