Hey K:
While using the word "nonsense" may have been a little strong, and yes I will concede that using a red strikethrough is more user friendly, I will re-iterate it is a low demand feature. The average home user has only had access to color printers at a reasonable
price for ca. 7 years ... Businesses maybe a few years longer. Before that all printouts were B&W. Even today, despite "paperless office" initiatives most people deal with printed paper rather than online copies.
Think back, the origin of "red strikethrough" probably goes all the way back to the 1800's or earlier with paper and pen records. It was easy enough to pick up a red pen and a ruler to make the strikethrough. Even with typewriters it was relatively easy to
buy a 2 color ribbon and backspace, switch ribbon color selection and strikethrough in red, switch color back to black. Those options did not exist with the high volume line printers, did not exist with consumer dot-matrix printers, did not exist with laser
jet printers. Sure, it has been a possibility with color inkjet printers since the mid 1980s, but early inkjet printers had other issues.
The simple reality is that the health industry, with this legal requirement, is just not a large enough part of MS's market to push developement of a solution. MS develops for the lowest common denominator, and slowly pushes out to fringe market requirements
later. Sorry, but that is the reality of Office.
Sure WordPerfect may have had the feature back in the 80's. But back then the market was several orders of magnitude smaller and it made sense for them to focus on the specific needs of specialist markets like medicine.