Please watch this - https://www.youtube.com/watch?v=94swlF55tVc

Any internal tool or debug GUI has reasonable odds of becoming a user-facing tool eventually, and it's a matter of time until you end up needing to support staff/customers in territories with RTL languages or ideographic character sets. At that point, you end up regretting most of the corners you cut.

I built lots of internal developer tools for a mid-sized western studio and it wasn't long until I had to go back and patch in a bunch of localization support because it turned out the publishers overseas needed to be able to use it and not all of their staff spoke English. Any blind employees were probably completely out of luck (maybe not, I did use Win32.)

Where do you draw the line? Some companies are using it for polished large tooling which may have thousands of end-users. Those users will eventually want a solution to tackle that.