We already have Blackrose Prison and Dragonstar Arena. I suppose public dungeons was supposed to be a bit like that, when most people had a DPS of like 10-15k, and before overland content was being made this easy.
What I DO lack however, are more SINGLE player arenas. We have Maelstrom Arena. I already have several of every kind of weapon, and most of them are pretty useless anyway - so I see no reason to keep doing it anymore.
However, to OP, the mini trial design is a lazy design. Instead of developing interesting mechanics Zos just overlayed more simple mechanics of multiple bosses and called it a day. As a result it was boring.
Against better judgement, I tried to pug VDSA out of Craggy Crag over the weekend. I don’t see much point in making another 4 man trial. So few of the people that want to try and experience this kind of environment will be able to do anything with it.
Same thing with VBRP. You know I still haven’t got a crew to beat that either.
It does them no good to make content only %5 playerbase can do.