The vast majority of IT professionals are supporting the operation of business, not running the business.
So its easy to say, stop using this old OS or application. It's not always that easy for a business or organisation to stop using them however.
As a MSP we have wide range of businesses that we support including for example manufacturing organisations with engraving machines that are the size of a small bus, cost upwards of $500,000 and come with a dedicated PC provided by the manufacturer (running XP!!!). So when asking the business to upgrade their XP PC means spending half a million $ you can imagine the conversation.
Another example we have is an irrigation CoOp in the Australian outback covering an area about the size of half of Europe. They have hardened PC's running/monitoring remote pump stations (when the temp can get up to 50+ Centigrade for 8 months of the year it needs some serious hardware) most of which are still running XP or Win 7. Each PC pre-Covid was costing anything up to $15k and they have over 100 of them. And when it can take a couple of days to physically reach some of the locations (serious outback cross country driving), the decision to replace any PC's just because of their OS has to be taken seriously.
On the flip side, as an IT professional I completely agree that anyone using unsupported OS/Applications should be talked to sternly

As a vendor Veeam is in a no win situation. Keeping the old stuff is expensive and can hinder/impede new features to support new OS and applications. But the good news that seems to be missed by many is that Veeam is quite good at supporting its own older versions. If the new version no longer supports the OS/Application version you need, then just continue using the older version of Veeam. v9.5 looks and feels old now, but it still works and is still supported.