I bought a dell 4550 in 2002 that had a non standard powersupply case, it didn’t fit in standard atx cases because it was upside down.
There was also a non standard case fan that had inverted the power connectors, so that yhou had to either manually pull apart a replacement fan and resolder the wires, or go without the fan fault protection and fan monitor at the motherboard bios level..
Dell has been doing this a long time.
My biggest beef with Dell and eMachines is the small form factor models. The Intel video cards embedded in the Intel motherboards fry and take the motherboard with it way to often. We have a few customers that insist on buying Dells and buying these small form factor Optiplexes. They just never listen. We resell HP Business Line with the old Compaq boards and have never had any problems like this.