"Why does the company force hardware upgrades?" Partly to pre-empt hardware issues. Vendors will only offer warrenties for so many years, because they can only

"Why does the company force hardware upgrades?" Partly to pre-empt hardware issues. Vendors will only offer warrenties for so many years, because they can only maintain stocks of replacement parts for any given model for so long. Once you have enough machines, a certain percentage of them will fail each year, and it becomes a game of numbers. A well-organized IT department will swap out your computer before it gets so old that there is a risk that it will suddenly fail in an unrepairable way.