I haven't disregarded that. And I do understand how important the gold medal is to Roger. And of course it's not for fans to decide where players play exos. I'm just saying that in the grand scheme of things I don't see how this hurts his preparation. I assume he'll stay in Europe unless there are grass courts in Dubai?
So though the scheduling isn't fantastic I also don't think it's that tough - given how much/how little Fed practices anyway there's no reason this should take up much of his time or harm his Olympics hopes in any way.
You have more chance of injuring yourself in a proper practice session than in a meaningless exo which is played in a casual way. More a shame because the venue is grass and really the only current player that makes sense vs Rafa on that surface is Federer. After that Murray is actually a better opponent on grass given their recent Wimbledon matches - better option than Ferrer though clearly not as big a name as Fed/Djoker/Agassi etc.
I don´t think anyone but Federer himself knows how much he practices, let alone what he needs to do in order to be competitive at the Olympics. Since it is the olympic year, these guys haven´t got much time off the whole summer, so the timing of this exho is the worst possible. If Federer´s participation was so vital to them, youd think they would have scheduled it a little better. Now all they´re doing is putting Federer in a awkward position, because he needs to say no, no matter how much he´d want to do it. And I´m sure he would do it, if only the timing was better.