Asus is clearly pitching its new ExpertCenter D700 and D500 machines at the IT professionals who would maintain them as well as the employers that would buy them. Their cases can go down to 9 liters (L) in size, and are made to US MIL-STD-810G durability standards. Furthermore, they have a tool-less design and have legacy serial and parallel ports.
https://www.notebookcheck.net/Asus-is-confident-its-new-ExpertCenter-D7-D5-series-is-a-dependable-new-option-for-business-customers.514872.0.html
Looks solid. But I still prefer the HP Z2 SFF G5. Their cooling and space management is 10/10 compared to what I see here. Still, kudos to Asus for moving forward with such a nice looking desktop