Non-preformed DfB, does it still happen?

The LFG queue concept is schizophrenic. On the one hand, it's a great way to jump into a team without forming or being recruited for one. On the other hand, not all teams formed completely at random work well. The DFB trial is such that, in general, completely randomly assembled teams are probably OK. A fair bit of content would probably be OK like that. Incarnate Trials are not like that, especially the newest ones.

Another issue with the LFG queue (one of many, IMO, but this isn't the thread for that) is that its rules are more ... arcane than I think most people expect. They are not clearly documented in the interface, and the short, simple descriptions on the interface are potentially misleading. For example, "Willing to join in progress" will never add you to any trial team that already has the minimum number of players - something I don't think is documented anywhere in the interface.

We cannot take the absence of a feature to mean that the ability to do something was explicitly decided against. It could also mean it did not occur to them that people would want it. There is a world of difference in "we thought of you doing this but chose not to give you the ability" and "we just didn't think about you doing this".

If the devs came out and said they never wanted closed leagues, that'd be one thing. But to Ironblade and Forbin's points, even if they did say that at one point, they've clearly changed their minds.