Honestly, glyphs are already annoying. As far as I can tell, their purpose is to ruin the day/plans of characters that don't have a specific counter.
Blocking portals, blocking enemy SHs, blocking bridges, blocking resource buildings, are all examples of griefing-adjacent activities that would be bolstered by this change much more so than what you're describing as griefing here.
When captain asshole the corruptor saves up 50 spellgems of protection, takes down your ward, then spams them in your SH leaving you to dump 800 mp into gge, now that will be griefing. And if your small faction doesn't have a spellcaster with GGE, you're really out of luck.
Spells: Glyph Endurance
Re: Spells: Glyph Endurance
Some classes (Advocates, Corruptors) have incredibly good MP economies. Some classes (Revenants, Holy Champions) have highly limited MP outputs controlling what they can and can't do.
Right now, Glyphs are one piece of a multi-layered defense strategy. Not a useless one, nor an unbeatable one, but one that forces your enemy to bid higher in order to raid you. There's a reason why Glyph Mastery is one skill instead of a whole intricate tree of skills, or something that an entire class focuses around - it's useful but not pivotally important.
Allowing classes with really good MP economies to stack glyphs in a way that only someone with a similarly good MP economy could take them down would likely hurt gameplay more than it helps.
Right now, Glyphs are one piece of a multi-layered defense strategy. Not a useless one, nor an unbeatable one, but one that forces your enemy to bid higher in order to raid you. There's a reason why Glyph Mastery is one skill instead of a whole intricate tree of skills, or something that an entire class focuses around - it's useful but not pivotally important.
Allowing classes with really good MP economies to stack glyphs in a way that only someone with a similarly good MP economy could take them down would likely hurt gameplay more than it helps.