A 12/13 generation NUC with 64GB RAM eats most of those very outdated servers alive.
And storage you can easily put into a NAS with SFP+ slots.
pro argument for 10+ year racks are:
- if you have free energy
- heating included
- direct attached storage for performance tasks (you can get around that easily with multiple NVMe - not in a NUC though)
- looks professional
Running costs are a thing unless you have free energy as posted before or mama pays for it.