Shouldn’t need the full blown Word to make a simple text document with different fonts and basic page layout options. WordPad is very lightweight, not like removing it saves any notable storage space.
What’s to support? It’s WordPad, it’s pretty self-explanatory, and even if someone has a question, there’s the help file.
And I can’t see any reason for them to need to update it or anything, seems like it was fairly well polished for a simple word processor.
Support from the development side of things. Every feature Windows pack has a cost attached to it. Microsoft tends to prioritize features that are used by most users and prune the others to cut costs down.