You may not have ever had to deal with SCSI termination errors before. Earlier system had to have the device numbers manually assigned, if they were wrong, all sorts of weird things could happen (of just nothing would work)
I'm a SCSI fan, but it took a few revs to get it righted.
SCSI was so much less tedious than dealing with IRQ / DMA / address hell on ISA cards, though. Once you understood it you could apply that knowledge across lots of platforms and devices. SCSI was much less arbitrary than dealing with random devices from manufacturers who each thought up their own way of setting configurable parameters (jumpers and DIP switches, option ROMs, tool you boot in DOS to frobnicate settings in an NVRAM, etc).