Can we revert the nerfs to Thornmail?

Back before it was nerfed, it reflected 30% pre mitigated damage. Which was extremely useful against an all AD team. However in it's current state, it reflects 15% +25% your bonus armor. When you add this effect into the current meta, it loses even more of its value as not only the damage is nerfed but there are so much armor shred now that buying an item that adds health and armor is better.

Lets try some math here. 300 ad with crit and IE

Old Thornmail (30% reflect)

300ad2.5= 750 750.3= 250

New Thornmail (15% reflect + 25% bonus armor)

750*.15 = 112

Now how much armor do you need inorder to just match the old damage? 200 bonus armor? Nope, that just adds 50 damage. You would need AT LEAST 400 bonus armor to even get relatively close to the old damage and that'll just only be 212 damage.

Now lets take out the crit.

300*.3= 90

300*.15= 45

Now in the same case here, you would need 200 bonus armor to match the prenerf damage. Now some might argue that the current version is more useful against minions and champs who deals lower damage. Thornmail already provides half of the needed requirements and even then you're edging onto 300 armor territory which is almost never achieved unless you're playing Rammus.

So would reverting the nerf be a good option to our current tank melting problem?