Why did they change silver dragons from NG to LG?

This is the only creature in existence that I have wrote something on. I love the idea of this dragon, man.

Still to this day, after literal years of DMing and about a dozen different groups that I've done full campaigns with, I still often incorporate this creature into campaigns.

"Oh yes, here's this really old man that's unmoving in his ways of law and good, but still offers incredibly wise advice and has about all the knowledge you could ever dream of; he occasionally disappears for weeks at a time and comes back with a few scars, which doesn't make sense to you, but you've learned to not question it at this point"

Or, a bit of writing for a cool scenario:

A Dwarven cleric in shining silver plate armor wields nothing but a massive mace that's had the insignia of the platinum dragon, Bahamut, engraved into its hardened and worn metal, and is seemingly made of the same silver as what he wears. One day, while venturing out into a shadowy marsh told to harbor ancient, shadowy evil, you hear a low, bass filled roar scream out in the distance. The ground below you begins to shake as if an earthquake has suddenly unfolded, and the awe-inspiring sound of what is undoubtedly massive wings meets your ears. The cleric you've had by your side for incredibly long at this point simply says for you to not follow him and run if he doesn't come back, then takes off his armor and drops his mace, leaving but a simply clothed man with the faith of a thousand more, and he sprints off into the trees. Moments later, that same thunderous quaking of the earth is felt before the same sound of rapidly displaced air is heard, and moments later, a conversation in draconic bellows out from above, its origin fully concealed by the melancholy looking trees;

"I have fought many of your gleaming kin, and have yet to see one live if they were to challenge me. This fate will befall you as well, if you do not retreat from my throne in the marsh."

"And I, the same.  If you are the one that has corrupted this land, leaving nothing but bubbling pools of corrosive death and twisted flora in your wake, then you shall be smitten by the same gleam you speak of."

And so, with that, two roars of equal power assail your ears, and the sound of rapidly batting wings, the clash of gargantuan beasts, and one singular roar of defeat signify a battle thousands of times more powerful than you and your band of adventurers could likely comprehend. And as you hear an equally loud thud, the air around you seems... lighter, almost as if some evil that was infecting it has been cleared, or has lost its source.

Moments later, the dwarf sprints back to you; his body is covered in badly bleeding wounds and marks of corrosion, still bubbling, but he seems to pay no mind to them. He says "I apologize that you must know of my nature this way. I will explain everything, once we go back and collect some trophies from that vile beast, hopefully for a high price," before letting out a hardy laugh and striding confidently towards the area you heard the beast fall from. And so ends this weird fanfic lmao

I want to hold up a silver coin, look at the dragon, look back at the coin, look at the dragon again and say: “Is this your brother?”

one time my players killed one of these and the trifling paladin said "dragon more like Dra-gone"

I am immune to cold so his most useful breath weapon is useless against me,    but  .................                      He paralized me then abducted me so thats great

Ok

Quote from SylvisSalicir >>

My current character has one of these as a companion. Lets just say, when he goes into the arena, most enemies lose their will to fight.

 Your DM is the best!

That appears in the physical monster manual during the part talking about silver dragons as a species, maybe not here since this is for specifically ancient silver dragons