I think the removal of the FIA and ATS frequencies from the Visual Charts would be so that finding the appropriate frequency to make a tracking call for a VFR aircraft isn't so easy. This will then lead to less VFR calls being made (which is what NAS wants from what I have read) as no one will be bothered looking for it.
I think they should also take it one step further and add appropriate Flight Watch frequencies on the appropriate visual charts (unless i've read point 4 wrong) so that VFR flights can have this information readily at hand as this is the frequency we are being encouraged to use more.
As for the holding points the only reason I can think of is so that VFR flights know where there may be a higher number of possible IFR flights that may conflict with their flight and that VFR flights should stay away from these areas.