7.1 AFIS should be provided from a location where there is the best possible view of the aerodrome and the surrounding area.
Only a couple of the old FSU's even complied with that!
One of the old DCA managers had a policy of building new units so they did NOT have a view of the aerodrome. But regardless, the old AFIZ did work- no CTAFs then so all on the same freq. Maybe the return of the AFIZ?