Just another opinion, but any time an EFC is issued, I think most dispatchers will take it as a "shotgun" estimate. Most of the time, it'll be less.
To some extent, again, IMHO, it's a moot pont, in the sense that whether a :30 EFC is issued or a :60 EFC, the dispatcher is still predicating a "bingo" fuel based on aircraft fuel status, and not what the EFC is. If the aircraft gets to "X" fuel, and they're still not cleared inbound, it's the big adios and we're off to the alternate...
I fully understand and appreciate ZID's perspective, especially when it comes to info flow (volume) when everyone wants/needs the info. I recently had a situation at PHX
where they weren't taking arrivals due microbursts at the airport, and spinning at all fixes. After about :20, things got better and they started landing again, but then I had another aircraft go into holding (ZAB airspace) and tell me it was due to microbursts at the PHX
airport, as if that was a current condition. I have no doubt that the ZAB controller gave him the latest info s/he had, but it's likely they didn't know (yet) that conditions had actually improved.
Info flow can often be like a freight train starting up, in that there is an "accordian" effect....
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.