In fact, it’s my #1 pet peeve right now. No joke. Not only that, the epic glyphs are the biggest problem for me as well. I save them up until they become unbearably cluttered () then try to clean out the extras all at once. The process then repeats.
The epics are too valuable to arbitrarily merge yet not valuable enough to keep them all. So, yeah. I waste a lot of my time double-checking most of the epic glyphs before I merge them into another glyph. The exceptions possibly being the small handful that I have memorized, in theory. In practice, I still double-check everything just to be sure. There is no undo.