In my opinion using HUD isn't cheating or unethical.
If the
poker sites make it very clear that the use of HUD is allowed, all players who play on the site end up agreeing with this rule, otherwise they wouldn't play. So, there's no possibility of talking about cheating.
I also disagree that it's unethical, I don't think that using HUD goes against the principles of poker players.
That said, I'm against the use of HUD. I believe it would be much more fun to play without this tool.
In addition to providing equal conditions for all players, the game would be much less mechanical and much more analytical.
Players would have to play fewer tables at the same time, for example, in addition to having to use their brains more, they would have to think more about each move, each hand played.
Amateur players would also tend to be favored, as the vast majority of them don't use HUD, and I think this is something very important, amateur players and beginner players should have more fun and not just be hunted at the tables.