No, really, join your frames.
So, customer just moved here from Denver. She had a frame that fell off the wall so she brought it to us to fix.
It's a 40 x 53 poster. The molding was 3" wide, kind of a porous wood. Seems like a Larson knockoff. 1/2" gold bead fillet. She brings it in in pieces and is very concerned about making sure it doesn't fall apart again. Upon looking at it, the frame has not been joined at all. The corners were glued, then the poster and plexi were taped together with packing tape and then the whole thing was assembled in the frame and sealed with brown duct tape. The duct tape didn't hold squat. I thought it was a furniture store job, but she said it was custom. I have a general policy not to throw other framers under the bus, but once I pointed out the lack of joinery (while explaining why it would not fall apart again), she was not a happy camper.
Dear Denver framers, if this was your work, please consider at least a thumbnailer. If this had been glass instead of plexi, someone could have been seriously hurt. As it is, your customer is out about $120 in repairs. No maker's mark so I can't give you a heads up, but hopefully you are a Grumbler and won't be surprised if you get the call.
No offense intended to the great city of Denver and all it's many talented picture framers.