This stuff was NEVER advertised to carry over. Neither was everything else you put so much "work" in.
If you want your old gear to remain useful way later in the game, then go play World Of Warcraft where Transmogrification is a thing.
Destiny Is a videogame. It is a luxury. You will survive without your silly emotes, fancy sparrows and the other crap you bought.
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I don't see why this is such a big deal. This game has been here for nearly 3 years. 3 years of the same reskinned guns and armor. I get it, you spend hours upon hours trying to get the stuff you wanted but its time for something new now. This is not the end of the world. Move on.