Okay, that's a bit radical for me...
I was a Windows guy from the 1995 to the early 2010s, so I don't have my version numbers quite right on the Mac side, but there were a number of nice features added to Word after 6, e.g. on-the-fly spell checking, on-the-fly grammar checking, etc. All things that would fall in the 'we had the idea before but the hardware couldn't do it until the late 1990s' category.
But what seems to have happened to MS Word is that around, oh, I don't know, version 2003 or so on the Windows side, they seem to have run out of obvious ideas in that category and most of the added features, other than the (nice) UI revamp with 2007, were more of the collaboration/Internet/etc variety than anything else. It's actually only in the last few years that they've started innovating a bit again, e.g. with that new grammar checker that finally replaces a grammar checker that I think had been unchanged for 20 years.
I think I'd be mostly fine with Word 2000 on the Windows side or... what's-that-version-I-have-on-OS-9-on-my-MDD on the Mac side, but going back to Word 6? Wow.