I didn't know that! Wow, Jobs must have relented. I remember him lovingly look at the Next cube and gushing over it's nearly unblemished perfection (except for the disk slot) ... he always looked at the side or front.
I don't think Jobs was ever "against" front ports, internal expansion etc. other than on consumer-oriented "appliances" like the original-concept Mac and original iMac. A lot of the modern "what Jobs would have thought" reasoning is really dumbed down to "what Jobs thought about mass market appliances".
The "pro" G4/G5 towers and the original Mac Pro didn't just have front ports and internal expansion - they went
way beyond the call to provide tool-free internal access and modularity - as you'll know if you've ever swapped out a hard drive or upgraded RAM in the typical PC tower vs. the "classic" Mac Pro. There was nothing that looked grudgingly "relented" about those designs. Even as far back as the Apple 2 - internal expansion slots accessed by a lid held on by some clever plastic clips rather than screws.
As for the NeXT cube - well, that was mostly pre-USB/Firewire and front-facing RS232 or SCSI connectors weren't really a thing anybody wanted. Plus, ISTR, the keyboard, mouse, audio connections were, originally, all built into the
display.