We do have live Ticket Availability status! Just go to the specific train and hop over to the "Availability" Option.
And as for personal details, I'm not sure but I guess the logic that the moderator had in mind probably was that it doesn't matter how old you are, etc etc. As a railfan or a rail enthusiast or as simple as a tourist or a traveller we're only concerned with your home/nearest station! That keeps the site sweet, simple and to-the-point. As we be here for long and socialize all the other details get exchanged automatically. Why bother people with unnecessary form filling if they're only here to know what platform does Mumbai Rajdhani depart from. :)