I think you are probably correct in organized groups with people who are trained and good in their classes; however, I find boon chronos are actually effective in certain strategies and scenarios. For example, If you notice boons are dropping frequently, an Inspi-SOI chrono is really nice. You don't need boon duration for Inspi/SoI chrono since SoI is not affected by Boon Duration, and you can just take that in your standard STM build at a dps loss, but if you're tanking with a shield, then you want at least some boon duration over normal STM boon duration, since you have less access to clones, and therefore less quickness generation via STM. Boons dropping can frequently happen in PUGS, in bosses where people are splitting up a lot and don't regroup quickly enough (e.g. VG, Xera under 50% teleports), or in bosses that are frequently a little messy with people scrambling everywhere or worrying about mechanics instead of applying boons (e.g. Deimos, Dhuum). Additionally, just like your example of Soulless Horror, Largos split strat is another example where chronos are covering alac + quick, unless their playing perfectly, a little more boon duration is a nice thing to have. That's already like half of the toughness tanking encounters. Another scenario is if you're responsible for 10-man quickness. You want a fairly high level of boon duration to make sure the quickness doesn't drop off anyone, in conjunction with inspi+SoI and high clone generation. If you have low clone generation, such as if you're not taking greatsword, you want even more boon duration to make up for less frequent shatters. Point is, ideally yes, we don't have tank chronos anymore. However, in that same ideal world, we have druids/alacrens tanking, we have chrono/DH stacks so we don't need a dedicated quickness, we don't even use 1 hfb because 1 healer is enough. We don't even need to reapply boons frequently because encounters don't last that long. We just don't live under that ideal world, and boon chronos are good at making up for that.