There is good reason to petition Microsoft not to do this, but too many of the discussions break down into simplistic "just use Word" (Microsoft's answer) or "use xyz alternative" (fine for personal use and some businesses, but wholly unrealistic for many businesses).
Microsoft seems to think you either just need a plain text editor or full Word, but there is another purpose for WordPad that few outside of specialized business technical support know about: it can be used to repair corrupt Word documents which Word itself refuses to open and repair. My educated guess is that since it supports the .docx format but only a subset of the functionality, it ignores some of the more complex formatting that can cause weird formatting corruption issues that can't readily be fixed by Word itself, or in some cases report a document as corrupt, leaving only the "recover text from any file" option. With WordPad, the same .docx file Word refuses to open can be opened and then saved again, removing the corrupt formatting in the process. Some QC work is necessary afterwards to verify formatting, but this can save many, many hours.
TL;DR: WordPad can be used to avoid missed business deadlines, people getting fired, etc.