Let’s try to stick to the real world. A full-boat Microsoft Enterprise user doesn’t earn Microsoft $500 in NET REVENUE every two years. A full-boat Mirosoft Personal user doesn’t generate $500 in NET REVENUE every five years. My 2018 Surface Pro 6 runs Windows 11 well enough for general document editing and web browsing.
Microsoft isn’t a charity and it isn’t a government entitlement program. It would be nice if hardware manufacturers designed their products to be easily and affordably upgraded, but that would increase their initial size, weight and cost, which market experience says is not what customers want.
Microsoft doesn’t need to working about retaining customers. The Office document format is a defacto industry standard. And what is the alternative? MacOS or Linux MacOS is nice, but you don’t see Apple giving any discounts to try and increase market share. Linux is a disaster for the average business and home user. Libre Office, Apple Works and Google Workspace all have interoperability issues with each other and Office that make them unsuitable for use when you need to share documents with other companies.