> No way one can comfortable run modern software on 2015 machine

My personal laptop is a ULV 6th gen i5 with 8GB of RAM. Gets the job done, slowly but usably. That's about 9 years old. It runs Ubuntu. A dozen or so Firefox tabs, Kicad, VS Code, Slack. Computer things.

I'm of the opinion that application developers should be given middle-tier consumer systems as work machines. The whole notion of "dogfooding" is "dog-something else" if your devs experience the product using different hardware from the customer.

My initial reaction was that old compute levels are probably good enough for modern applications, but after thinking through all of the common use cases you’re probably right.

I think it’s AV that makes the difference. The modern smartphone does a ton of processing on the image sensor, and the modern laptop is expected to output multiple 4k video signals (zoom camera + desktop sharing) while accepting multiple video signals, without dropping below 120hz.

I think the reasoning is incomplete.

RAM isn't the only reason to upgrade. CPU's are more efficient, screens are significantly better and support variable-refresh-rates (and high refresh rates), battery technology has not stood still: even if they didn't degrade over 10 years.

There's plenty of reasons to upgrade to a new system even if it has the same memory capacity on paper. The memory will probably be faster and lower voltage too.