People might not remember, but Word, Excel, and PowerPoint were all released for the Macintosh before Windows. Back then, the Macintosh versions were 1st-class citizens and (and you mention), Windows versions were a buggy mess.

Having used versions on both for years, I'd say there was a "dark" time around 2011 when the macOS versions were lagging badly feature-wise, but they're pretty much on-par today.

My biggest complaint is that you can't turn off the ridiculous animations in macOS versions (e.g. moving between cells in Excel). That makes the entire suite "feel" slower when in reality, the macOS version could easily be just as responsive as the Windows suite.