This is NOT about whether any change is appropriate; indeed, other means of solving the adfarm problem may be preferable. But at the moment we don't have a comprehensive list of what might be good or bad about any particular proposed change because we haven't collected in one place all the non-adfarming uses for 16sq.m. parcels. So, in hopes of finding the babies at risk in this bathwater, an attempt at constructing such a list:
Scenario A: 16s necessarily in the same sim as larger landholdings.
A1. Extra prims. (For example, a bonus 512 deeded to a group could use the tier bonus to hold an additional 48sq.m. in that sim to maximize prim allotment.)
Scenario B: 16s necessarily widely dispersed, ideally one per sim.
B1. Avatar keyscanning for Name2Key.
B2. Sim H/W neighbors (Max Case database).
B3. Other data networking, the purpose of which is not known.
B4. Parcel philately. (Collect one in each sim to win!

B5. Safe landing spot for bots.
The following are hypothetical in this category. Have not seen them mentioned as an actual application, so can anyone confirm, or shall they be omitted?
B6. (Hypothetical) Sim statistics collection. (Perhaps uptime, performance stats, administrative events, perhaps for use by Linden Labs competitors?)
B7. (Hypothetical) Sim parcel mapping. (Boundaries, owners, descriptions... perhaps for use by landbots to expedite evaluation?)
Scenario C: One or a few 16s on separate sims
C1. Script server redundancy.
These may unintentionally misrepresent the use cases. For example, I don't think I understand B5: unless blacklisted or security orb'd, isn't everywhere >50m above ground level safe? I guess it could be a pain in some sims to learn where to go to avoid the orbs, but is it more of a pain than holding the 16sq.m. microplot in tier--and still sometimes have to manually deal with b0rked orbs or encroaching prims? So maybe B5 is just stated incorrectly, or doesn't hold. (For all I know, the bots may only be there to service the scripts on the parcel itself.)
Also, right now, only Scenarios A, B4 and B5 seem to depend on actual parcel ownership; otherwise it seems to just be the ability to run scripts in a sim somewhere. If, hypothetically, script execution were possible without land ownership, are there other uses missing from this list? (Do any scripts of interest for such applications actually require parcel permissions for some reason?)
What have I missed, misunderstood, or misrepresented?