It includes some very large, complex distributed systems owned by a range of companies ( Microsoft, Google, CloudFlare, Facebook etc.) but within those companies there is a natural tendency to standardise on a single vendor and small range of devices to perform key functions like edge routing.
You are made aware at the meeting of the range of forecasts and where the central tendency seems to be, and are given a couple of days to revise your forecast if you are swayed by where you stood relative to the others.