Ok hear me out.
What if they revamped the entire warlock pet system to make it customizable?
Similar to how deathknights have runeforging, we would get a similar window, like a codex or something (picture the necro in D4 and their minion customization).
In this window you can choose up to two passives and 3 active abilities.
These abilities would be trainable by any demon, though not all abilities and passives are shareable.
This would result in more freedom of choice when it comes to pet versatility.
For example, felhunter’s spell lock? You can take it and apply it to any other demon, but there are limited slots so you would have to choose what to replace it with.
Likewise you would gain a unique ability called sacrificial pact, which allows you to sacrifice a single active ability from the entire list, making it no longer applicable for any demon, the tradeoff being you would gain it as a default ability (think GoSac), but you only get to sac one ability only.
Furthermore, instead of grimoire of sac being a talent, it would be an option in this codex, sacrificing the demon would give you stats (tunable so it isn’t broken).
Furthermore, the felguard is now baseline and available to all specs. Axe toss is only a stun (no interrupt) since you can now swap spell lock to any pet or even sacrifice it to gain it.
The felguard would then be the aoe/cleave pet,usable by any spec and untied to demonology (the spec), which frees us of the pigeonhole of only running a single demon as the “master of demons” spec.
In doing so, any felguard specific talents would simply become “primary demon” which allows you to run anything you want based on the situation.
Even allowing you to sacrifice your demon as demonology since the gameplay itself would not be about the primary demon anymore and the choice of customization affects the playstyle, offering the most versatile version of the class, where spell lock is no longer bound to felhunter and players have the choice to either keep it attached to the desired pet or sac it for personal use.
This version would allow you to sac the VW’s bulwark for a defensive while keeping the interrupt on an imp for example. Or sac the dispel or purge while having spell lock on the felguard, trading the taunt for the interrupt.
The versatility is endless, would finally justify teaching of the black harvest existing and would create a unique feature which is thematically appealing for the class.
What are you thoughts on this?