This suggestion is gonna be a bit more of a stretch cause I’m essentially suggesting to add insane power creep. However, I think it’s basically the only way to make the glyph useful in its current form outside of sealing random T1-2s to craft a T5 you actually want. I actually really like the mechanic.
With the current LP system. You basically always want to hunt for perfect exalted gear that you’ll eventually combine with a LP 3 or 4 Unique. However, this essentially completely invalidates having 5 affix Exalted gear. Since you can already achieve the same level of power with even an LP 2 Legendary.
The main idea would be to increase the LP possibility to 5. Incentivizing people to attempt to get 5 affix gear to eventually combine with a legendary. I think it honestly balances itself by how insanely rare it would be. Not just to get an LP5 but to actually get a good 5 affix exalted item with the current rng.
Personally. I actually think Glyph of Despair should possibly just be changed to better fit the current system. I just don’t know what you would actually change it to be. The obvious answer would be to introduce a bunch of affixes that can only be on exalted gear. (More stuff like experimental affixes basically) The main idea would be to do something to give exalted gear more power to be better in line with Legendary gear if you have the crafting material and glyphs to actually invest into it. Something I kind of though of last second. Another solution would be to allow more than one sealed affix. This would give a higher ceiling to Exalted gear at the cost of the same level of rng as LP5 would be.
Edit: If there is something I don’t know about let me know. I know there are a few other things I could have addressed but I think this gets my point across fine. This suggestions is definitely more thinking towards the future. Power creep will happen. It’s just best to know the direction the wind is blowing before hand