>Assuming a five-year lifetime shows a lack of knowledge of how the product is typically used. a five-year lifetime is is business decision balancing customer

>Assuming a five-year lifetime shows a lack of knowledge of how the product is typically used. a five-year lifetime is is business decision balancing customer expectations and maintenance cost (including keeps a hardware stock of these routers in each continent, sometime even in country for specific countries, keep development alive, etc.). You may say they underestimate the willingness of their customer to buy a new router after 5 years, but they definitely know that a huge proportion of their customers are running woefully out-of-date and unsupported hardware/software. Same for all on-prem vendors and a major reason why moving customers to cloud is so appealing for so many vendors.