But her HotS abilities are in WoW, as are Gazlowe's. You said what works in a MOBA doesn't work in WoW, yet we have multiple examples of MOBA/RTS abilities working just fine in WoW.
Wailing Arrow, Withering Force, Sundering, Crash Lightning, Frostwyrm's Fury, The Hunt, and other abilities are usable by WoW classes.
Death Pact, Death Coil, Unholy Frenzy, Raise Dead, Drunken Haze, Drunken Brawler, Breath of Fire, SEF, Metamorphosis, Hex, Chain Lightning, Feral Spirit, Infernal, Avatar, StarFall, and hundreds of other abilities came from the WC3 RTS, which is where MOBAs come from. In other words, not only can MOBA/RTS abilities work in WoW, MOBA/RTS abilities form the basis of WoW abilities, talents, and passives.
Why would you apply the exact same tactics in a MMO format that you would a MOBA format? You can give the Bronze spec the exact same abilities, and it would work just fine;Chromie's entire kit is based around using time traps to freeze enemies, primarily other heroes, in place so that she can connect difficult to aim skillshots that have a nearly 1 second delay before landing. This would not work in WoW. The Sands of Time theme could definitely work, but I suspect it will be a healing spec not a ranged DPS spec.
Sand Blast: Fires a missile of sand that deals damage and leaves an echo behind that can mimic the caster's next attack. Echo lasts X seconds.
Dragon's Breath: Launches 3 blasts into the air that lands every x seconds towards the targeted direction.
Time Trap: Places a Time trap at a location that activates after 2 seconds. Enemies caught in the trap are time stopped for 2 seconds. Caster can detonate the trap.
Slowing Sands: Summons a vortex of sand that slows by 10% every X seconds, up to 70%.
Temporal Loop: After 3 seconds, sends a target back to the location where Temporal Loop was originally cast. Caster's abilities recharge more quickly for 3 seconds after casting.
Timewalker: (Passive) Learn talents 2 levels earlier.
Where's the issue? Those abilities fit WoW just fine, and from those 5 abilities you can easily expand the concept.
This isn't Guild Wars man.Here's a good example of a Chronomancer from GW2:
https://wiki.guildwars2.com/wiki/Chronomancer
There's definitely plenty of design space left to explore especially from a support standpoint.