IBM didn't create an innovative product though. If you look at the era, there were dozens of machines of a similar style on the market, either z80 or 8080, 8088, even 8086... but they ran CP/M. PC-DOS was effectively a kind of fork / rip-off of DR's CP/M, but clean room and customized for 8086.

IBM created a rather generic machine using off the shelf components, and someone else's operating system.

Innovation factor was almost zero.

The only advantage it had was it had IBM's name on it, and IBM was still a Really Big Deal then. It brought "respectability" to a thing that before was still a weird subculture.

I don’t know, I think the concept of a BIOS with a documented API and the included minimal component set (e.g. serial port, parallel port) raised the bar on what third party software could assume existed and could be accessed over the existing 8-bit computers if the time.