It absolutely was. Simply on account of the name on the grey box.
If it hadn't been IBM, maybe somebody like DEC may have gotten their shit together to take the market instead of farting around with overly high margin products and eating themselves from the inside.
But the way "business" culture was in the 80s the "respectable" productivity machine could not have come from the games/"home" market. Apple maybe but they opted instead to go close off the Apple II line (which in fact had a strong productivity sector thing going on, especially in schools) and push the Macintosh which was a good product but started off weak in terms of capability and costly on price.
In the early to mid-80s it was either going to be a CP/M machine or a CP/M-like machine (like the PC). These are Visicalc/Lotus-123/WordPerfect machines to their customers, and they cared not at all about graphics capabilities until later. Just needed 80 columns, floppies, and reasonable amounts of memory.
Hell there was terror in the microcomputer market when IBM made moves to go "downmarket" into it with the PCjr (which was a flop). The hype leading up to it, and the noises about how it would be a Commodore and Atari killer was insane.