I think your missing my point, by design you cannot die with Trusts, if you do the trial would reset since there is only one fight, you would never progress.
You can do it in 5 minutes with a team of players it would take me 110 minutes to do it with Trusts, I still choose the second.
If I fail, there's only me, I don't fail because someone failed...
Most of the content can either be cleared with squadrons or Trusts, no reason not to make all content available for that bar the latest raid/extreme/ultimate.
Please bear in mind this is only my opinion and nothing else.