The hate comes from people that have no idea how business works. To stay in business a company has to grow sales every year over the previous one. A large portion of most growth comes from introducing new products. They all won't be successful and some will cannibalize existing lines. But when you introduce new product you get a sales boost filling the pipeline. Most retailers will order the new stuff to put on the shelf.
Hornady gets a large amount of hate because some, lets say less than brilliant people, believe they are being harmed by the "marketing" of new products. When in reality Hornady just wants to be profitable, grow, and be in business next the next year.
There are not a lot of companies that make the stuff shooters use, if Hornady were concentrating on the legacy cartridges they would be gone with no one to fill the void.
So THANK YOU Hornady for making the stuff I use. Like 218 Bee brass- a cartridge that has not been chambered in rifles in any quantity for decades. And for quickly building a custom size die for a custom rifle I had built last year. And for having more bullets on the shelf than ALL other bullet companies combined.
Haters are gonna hate, but I would bet they would hate to see Hornady stop being successful!