??? Trials have never been exclusive to primals, not even in ARR, yes they've been the primary target for it but that doesn't mean we can't fight anything else and we've already seen them replace primals plenty of times. Trials are just bosses we beat to shake up the content so we don't just do dungeons and solo duties in the MSQ, they also offer different content and difficulty than normal and alliance raids do. (less so normal as they did away with the structure from ARR and HW)

Also no, DT haven't been uncommitted to the concept, we just haven't gotten the optional trials yet and also the story isn't over, most trials per expansion are linked to the MSQ after all.

I do think they way they wrote off primals at the end of EW as "problem solved" is stupid, like the concept don't have to be discarded just because tempering has a cure now but they will never do away with trials, be that for good or for bad.