That's literally the worst argument I've ever seen. No, armor doesn't mean nothing anymore. It's just that you're playing against a meta that is meant to be able to play around a team comp and not susceptible to beign 1v5'd by the enemy tank. You know where nautilus is in the rankings? almost nonexistent because he's considered so weak and yet one piece of armor grants enough to sustain him in lane early game and he's beefy in the late game with only 2-3 items.
You're complaining because the tank meta has passed and we finally reached a point where a tank can't 1v5. Get over it. Armor is as useful as it needs to be.
Judging by the champs you play, I have no idea why you're complaining about the tank meta/armor in the first place. You don't even play the champs that have good benefits of armor, you play abusive bruisers and immobile tanks.
If you're complaining about this then it's clear you have an issue with the late game but here's the deal, the enemy has had enough time to build against your armor and will play around you if you're playing these abusive bruisers and immobile tanks.