Yes this is true, those production breeds just burn themselves out laying so many eggs. They are highly prone to reproductive cancers also - poor wee lovely darlings.Yes, their performance is unrivaled but it comes at a costly price as they exhaust themselves rather early on and their tiny bodies succumb to the overexertion.
I have 3 Azur Blue and they are a leghorn x Araucana hybrid - they lay almost every day - large blue eggs - I am preying they moult and stop laying soon, they are a yr and a half so have been laying over a yr now.
Leghorns are lovely wee hens - just wish they weren’t so prolific.