So your narrative is to succumb to the reality and propose solutions that arguably by your own admission are bad? - I don't think they're trying to develop the game as a solo experience versus just trying to facilitate players being able to do so if they wish. There is a stark difference between making these systems optional and essentially mandating them, especially when they arguably have their own benefits.
Many of these trials are not really a matter of simple ease versus a product of a poorly designed syncing system, wherein many encounters just simply become slugfest due to out-gearing them by almost double their required minimum item level. Not even A4S was spared this gruesome fate by the end of the expansion. They should look at redesigning how this works before they elect something else. That being said, your approach of essentially it being inexcusable due to the trust system is just inflicting the self-same sentiments on other players as those who have been subjected to oversimplifications. All you really do is flip the coin from:
- Well the game should accommodate to the lower common denominator to ensure everyone can complete the content - Over to:
- Well if you can't keep up go do trusts and exile yourself from the multiplayer experience.
Things like these work great as 1-off experiences if the duties are to be treated as such. But I would argue that whilst many people would appreciate some more difficult encounters, they would not appreciate it to be the norm. People could barely handle getting Shinryu in their roulettes.
Editing you in:
Call me pedantic or whatever. But this example in addition to many others is why I personally don't necessarily buy into this platitude. Regardless of whether the content is too easy or not. Historically when players have gotten something that isn't necessarily efficient, or quickly then they've often resorted to avoiding it altogether. Personally, I recall Shinryu getting so bad at times that people would just sit and AFK essentially holding the duty hostage until they got kicked.