The spec feels stale, boring and dated, it needs more than a few minor tweaks. Having looked at other specs that have had a rework over the last few years it’s clear Destruction needs the same - Mages, Ret Paladin, Frost and Unholy DKs and others, they have mostly been received very well and the reworks have fixed a lot of the long standing issues the specs had and made them more popular.
Destruction has been fairly unchanged for several years, a few minor adjustments and the odd new talent here and there, but mostly the same.
The spec struggles in single target because of havoc/mayhem, and it’s AoE is restricted because if rain of fire becomes too strong then it overtakes Chaos Bolt in single target.
Their spell effects look low quality, even the spell icons look basic, their Apex talent looks really out of place - green fire rather than shadowflame?
Demonology and Affliction are both in really good spots from a design perspective, but Destruction has been neglected. I hope the lack of changes in 12.0 and 12.1 point to a larger rework coming in 12.2 or sooner.