I would be slow to criticize them about how long it is/isn't taking them to release the gear. First off, they're the most generous artists going.....you could set your watch by them releasing an album, an ep AND (as of late) 8-12 hours of live material every 2-3 years. Second, as they've stated, they usually have to vet all the live material before making it available. That means listening to every set (probably more than once), mixing/mastering, and doing it all on top of preparing for upcoming gigs. That's not even factoring in the fact that may be working on a new album, AND have their own lives to get on with as well. So yeah, they can take as long as they like as far as I'm concerned.
As far as to the tour being a flop? Depends on what you mean. Financially i'd say they did fine. Some people (mainly on here) seem to dig the work. But in terms of how good the material is, I don't think it's their strongest work. You look at the sets from 2005 to 2010 and each set has about 6-8 sections that are just absolutely amazing. The 2014 - 2018 sets, about half that. These sets it's very hard to point at any given passage and say that it's standout AE. There's the ending passage of the Barbican set, but that's kinda it. Out of the 10 people I know, no one talked about it since.
I hate saying it all that, because I know they put a huge amount of work in to everything they do, but the material just felt a bit empty this time around.