> > May I ask why?
>
> ...because of the too long chain of function calls --
> >Don't you think this might cause performance
> problems? I am not sure yet.
Not really an issue here for most of the usage scenarios I would think.
Of course you'll have to decide yourself but I think the best way would be for you to test it out and see if it causes an important performance hit (which I doubt).
Regards