Your post was based entirely on a point that had nothing to do with the topic at hand, which isn't as clear an indication that you understood the point as you may think.
I got your point. Which means I got your point but I didn't want to discuss about it because it's a personal thing of yours =)
This, not only is difficult, but also breaks immersion, and makes the game much less fun to play if you are constantly
worrying about the time. An on screen clock is designed to prevent the need to be an obsessive time watcher if you have other things that need doing as well and allows you to just relax and play the game with little to no time worries. You can see the time, all the time, it becomes a background thing that is more in your subconscious than anything. Believe me, it works wonders.
Jumping breaks immersion, loading screens break immersion,... and now
If you have a clock inside your room, or simply your watch or handyphone, you'll check time very often if you have appointments or if it's almost time to eat.
TOO!?
As far as I know by playing ANY game, it Doesn't break immersion, because sooner or later you'll have to keep contact with the real world, about things you've said before. That's in ANY game.
Then if checking the clock on your wall breaks immersion, the clock inside the game breaks it too, because you keep contact with the real world messing with what you're doing in that moment. And don't Both keep you constantly worrying you about the time?
You may not, I do. I do not need a interface element to tell me what the in game time is, or what the phase of the moon is, or any other number of interface elements that we have that I find particularly useless. However these have a use for some people, and they are tiny, so its not really an issue. However being able to take one of these UI elements, and turn it into something that enhances my game play, and allows me to relax and enjoy the game, I do not see why some people are so opposed to an optional item, that takes a few moments to develop, that would allow many other players to enjoy the game better. Its not like this is a Jump vs No Jump debate, its a simple clock.
You'll need it =)
Do you remember in FFXI? Time played a very important role on the elements. ALso, remember that the Dev team is going to give the Guardians, the Date of Birth of your character and the Elements regarding the Moon Phases (which is already implemented, a lil... clanky, whatever it means) a meaning to be important into the game, so that will be important/vital informations in the future.
Also, I'm not opposed to the implementation of a Real Time clock. I just can't see the need. I would like to have it, but I don't desire to have it.