Getting those super sized eggs is always kind of fun...got one myself yesterday about the size and shape of your bottom pic. But, in the back of my mind, I remind myself how hard those big ones are on the hen's reproductive system and what could result from it if it would continue~prolapse of the oviduct, which is pretty much a death sentence to a hen. There's a reason that most eggs are pretty standard in size and knowing what I know now, I love seeing those L-XL eggs of uniform shape, size and color rolling into the nests...those monster eggs are kind of cool, but I'd sooner not see them nowadays.
There's really no way to prevent it, especially in older hens that are going out of lay for good as that's when it seems to be most prevalent and it usually seems to happen more to good layers that are aging out, like my leghorns or BAs.
It's not that people don't like hybrids, who wouldn't like having those steady, XL eggs for a year? It's just that people who have had them realize that the poor things have been genetically predisposed for early burn out and the burn out is usually not pleasant....they suffer from reproductive cancer and issues more than any breed or type of hen I've ever owned. They seem to have a sell by date on the bottom of their feet, much like the CX meat birds, and that's usually around 1 1/2-2 yrs of age. A person is fortunate indeed to have them live to 3 yrs of age and I've heard of it happening but it doesn't happen as often as in other breeds/types of chickens.
Your top egg is beautiful! I had a little NH hen that laid a striped and speckled egg like that every day of her life. At first I was saving them, but then I realized it was going to continue, so I just thanked God for them....she laid very well into her 6th year and I miss that little red hen and her beautiful eggs.