Havoc is the best for Maiden because we're a burst front loaded class and we happen to sync our CDs with the extra damage phases of the boss. That doesn't make us good for Single Target, that makes us good because the boss is made for us. It's not about the kill time either (even though it affects, but it does for every class with CDs)
There're at least 3 ST bosses in Tomb in which we're, at best, mid-top of the pack. (Goroth, Sisters, Avatar).
https://www.warcraftlogs.com/statist...t=99&boss=2032
https://www.warcraftlogs.com/statist...t=99&boss=2050
https://www.warcraftlogs.com/statist...t=99&boss=2038
And those bosses don't have the special "yo hit me in this phase while your CDs are up" phase. They're more normal.
Meanwhile, this is what happens when any form of Cleave or AoE is present:
https://www.warcraftlogs.com/statist...t=99&boss=2048
https://www.warcraftlogs.com/statist...t=99&boss=2037
That's exactly what I'm saying. Balance Druids do similar ST DPS to us, yet destroy us in any form of cleave/AoE. Sure, they don't have an immunity, but does that pay off? Look at warrior arms, they don't have any immunity either and they're taken because of their damage exclusively.
I don't know which people you're raiding with, but Havoc IS NOT desirable for raiding as it stands on Mythic raiding.
Half the classes have some form of immunity, and even if they don't, rogues are still a thing. Hell, even DKs can soak more reliably than we do. Havoc doesn't bring anything good to raiding outside of that single boss called Maiden in which we're not even that ahead from the rest of the pack even when everything beneficts us.
And anyway, if my class output is going to suck because I just soak very well, better rename the class to Soak Hunter. We're a DPS class, we HAVE to do DPS.