How is HUD customization an issue of competitive integrity?

Let me expand upon that answer because I see that it was confusing. Western audiences may not realize this, but there were some third party UI mods in Asia for a time that have players an unprecedented amount of control over the HUD down to providing zoom and scouting information. Even last hitting indicators were considered. Several of those options we feel violate competitive integrity even if their developers did not. Now maybe you weren't asking for that at all and just want an option to move your items. That's not something to which we are philosophically opposed. I was trying to point out why just letting players have complete customization had risks. I worked on the UI for WoW and it was a constant arms race to prevent UI mods from accessing and displaying information that we thought was unfair. That is the double-edged sword I was attempting to describe: there can be a lot of benefits to full customization and a lot of costs. If you aren't asking for this level of customization then my answer really wasn't appropriate for you and I apologize if I confused the issue.